Cortisone reductase deficiency is a rare genetic condition that affects how the body activates cortisone into cortisol. People with cortisone reductase deficiency often have features of too much androgen, like acne, excess hair growth, irregular periods, or early puberty signs, while feeling fatigued or stressed easily. It usually starts in childhood or adolescence and tends to be lifelong, but severity varies. Treatment often includes low-dose glucocorticoid replacement and medicines to manage androgen-related features, and many people do well with care. The outlook is generally good, and mortality is low when treatment is tailored and followed.
Overview
Cortisone reductase deficiencySymptoms
Cortisone reductase deficiency often shows androgen-excess features: early pubic/underarm hair, acne, body odor, and rapid childhood growth with advanced bone age. Many females develop hirsutism, irregular periods, and fertility problems. Some people have insulin resistance or obesity.
Outlook and prognosis
Most people with cortisone reductase deficiency do well once the hormone imbalance is recognized and treated. With tailored steroid replacement and monitoring of blood pressure, growth, and fertility, many lead active lives. Early diagnosis helps prevent long-term metabolic complications.
Causes and risk factors
Cortisone reductase deficiency usually results from inherited changes in HSD11B1 or H6PD, passed on in an autosomal recessive pattern. Risk factors for cortisone reductase deficiency include family history or consanguinity; weight and insulin resistance may worsen severity, not cause it.
Genetic influences
Genetics are central in cortisone reductase deficiency. Most cases stem from inherited variants in enzymes that recycle cortisone to cortisol, typically passed in an autosomal recessive pattern. Different mutations can change severity, treatment response, and family recurrence risk.
Diagnosis
Doctors suspect cortisone reductase deficiency from features of androgen excess and normal cortisol. Confirmation relies on urine steroid profiling showing a characteristic cortisol–cortisone pattern, plus genetic tests (H6PD or HSD11B1) for the genetic diagnosis of Cortisone reductase deficiency.
Treatment and drugs
Treatment for cortisone reductase deficiency focuses on balancing cortisol levels and managing androgen excess. Many start low-dose hydrocortisone to steady cortisol signals, which can reduce acne, excess hair, irregular periods, or early puberty. Ongoing endocrinology care adjusts dosing through stress, growth, and pregnancy.
Symptoms
Cortisone reductase deficiency can show up in everyday life as early hair growth, acne, or a growth spurt that seems ahead of classmates. It happens when the body has trouble turning cortisone into active cortisol inside cells, so the adrenal glands make extra androgen (male‑type) hormones. People often notice early features of Cortisone reductase deficiency in childhood or the teen years. Features vary from person to person and can change over time.
Pubic or underarm hair can show up earlier than peers. This often appears before other puberty changes. In Cortisone reductase deficiency, it’s driven by higher androgen activity.
Children may suddenly shoot up in height and outgrow clothes quickly. Growth can slow earlier than expected later on.
X‑rays may show bones that look older than the child’s age. This can limit final adult height.
Skin can become oily with acne earlier than classmates. Breakouts may be stubborn and keep returning.
How people usually first notice Cortisone reductase deficiency?
Many families first notice something is off in infancy or early childhood when a child shows signs of excess androgens: fast growth for age, early pubic or underarm hair, acne, or body odor well before puberty, and in some, genital differences at birth. Doctors often pick up the first signs of cortisone reductase deficiency after these features prompt hormone testing, which shows unusually high androgens despite normal or low cortisol activity, sometimes following an illness or stress when the body should make more active cortisol. In newborns, how cortisone reductase deficiency is first noticed can include atypical genital development in girls, while boys may seem typical at birth but develop early puberty-like changes in the first years of life.
Types of Cortisone reductase deficiency
Cortisone reductase deficiency is a rare genetic condition where the body has trouble converting cortisone into active cortisol, which can shift hormone balance toward higher androgen effects. Symptoms don’t always look the same for everyone. Researchers describe these categories to better understand patterns of the condition, and to guide testing for the underlying enzyme issue. When people ask about types of cortisone reductase deficiency, they’re usually referring to variants linked to different genes or enzyme steps, which can change how early symptoms appear and how strong they feel.
HSD11B1-related
This variant involves reduced activity of the 11β-hydroxysteroid dehydrogenase type 1 enzyme. People may have signs from childhood or adolescence like early pubic hair, acne, or irregular periods, often with normal or slightly low cortisol in tests.
H6PD-related
This variant stems from changes in the H6PD gene that affect the cell’s cofactor supply for the same enzyme. Many living with this form show earlier and sometimes more noticeable androgen-related features, and lab tests may point to a broader enzyme support problem.
Classic phenotype
This describes the well-recognized clinical picture of androgen excess with low-normal cortisol action and high ACTH drive. For many, certain types stand out more than others, such as early hair growth in children or menstrual irregularity in teens and adults.
Milder/late-onset
Some people develop subtler features later, like adult-onset acne, difficulty with cycle regularity, or challenges with fertility. Not everyone will experience every type, and symptoms may fluctuate over time.
Female-predominant features
People raised female may notice irregular periods, hirsutism, or polycystic ovary syndrome–like features. Doctors sometimes classify symptoms as reproductive versus skin/hair changes to track impact over time.
Male-predominant features
People raised male may show early body hair, acne, or rapid growth pace in childhood. Others are more noticeable in teen years, when hormone shifts bring skin and hair changes to the foreground.
What genetics can tell you about symptoms
Some people with cortisone reductase deficiency inherit changes in the H6PD gene that lower an enzyme’s activity, causing excess active cortisol inside tissues. This can lead to features like early pubic hair, acne, irregular periods, insulin resistance, and high androgen levels.
Causes and risk factors
Cortisone reductase deficiency is caused by changes in the HSD11B1 or H6PD genes. Some risks are written in our DNA, passed down through families. It is inherited in an autosomal recessive way, so risk rises when both parents are carriers or are related to each other. There are no known environmental or lifestyle causes, though puberty or pregnancy can make features more noticeable. Risk factors for cortisone reductase deficiency include a family history, having an affected sibling, and parents who are related by blood.
Environmental and biological risk factors
When people look for what increases the chance of cortisone reductase deficiency, it’s natural to wonder about things in pregnancy or the environment. Current evidence points mostly to body-based causes that are present from very early development, rather than outside triggers. Being exposed to risks in your body or environment doesn’t mean illness is inevitable. Below are the environmental and biological factors that have been studied and what they do—and don’t—seem to change.
Unlike some chromosomal conditions, advanced maternal or paternal age hasn’t been linked to a higher chance of cortisone reductase deficiency. Reported cases appear across a wide range of parent ages.
Common pregnancy conditions such as high blood pressure or diabetes have not shown a consistent association with this condition. Usual prenatal illnesses do not appear to change the likelihood.
No specific medications, infections, or radiation exposures in pregnancy are known to cause cortisone reductase deficiency. Standard guidance to avoid harmful exposures still protects overall fetal health.
Prematurity, low birth weight, or mode of delivery have not been shown to increase the chance of being born with cortisone reductase deficiency. This condition is present from early development rather than triggered by birth events.
Genetic risk factors
Family patterns often point to a genetic reason behind cortisone reductase deficiency. Some risk factors are inherited through our genes. Families often notice early symptoms of cortisone reductase deficiency in childhood, and the genetic pattern helps explain who else in a family could be affected. Most cases follow an autosomal recessive pattern, meaning both copies of a gene need to carry a change for the condition to appear.
HSD11B1 variants: Changes in the HSD11B1 gene can weaken the enzyme that turns cortisone back into cortisol in liver and fat tissue. Low enzyme activity leaves the body short of active cortisol locally, which increases signals that drive androgen buildup. This is the classic genetic cause of cortisone reductase deficiency.
H6PD variants: Variants in the H6PD gene reduce the cofactor that the enzyme needs to work inside cells. The enzyme is present but underpowered, leading to a similar picture often called apparent cortisone reductase deficiency. Genetic reports may list this as H6PD-related CRD.
Recessive inheritance: The condition usually appears when someone inherits two nonworking copies of an involved gene, one from each parent. With two faulty copies, the pathway to regenerate cortisol is disrupted.
Carrier parents: Parents who each carry one gene change typically have no symptoms. Together, they can have children with the condition if a child inherits both changed copies.
Recurrence chance: When both parents are carriers, each pregnancy has a 25% chance of the condition and a 50% chance of producing a child who is a healthy carrier. These chances are the same for sons and daughters.
Family history: Having a sibling with the condition or known gene changes increases the likelihood that other children in the family may also be affected. The chance is higher when parents are related by blood (consanguinity).
Variant effects: Different gene changes can leave some enzyme activity, which may lead to milder features or later recognition. Others severely reduce activity and may bring symptoms to attention earlier.
Testing options: Genetic testing that analyzes HSD11B1 and H6PD can confirm the cause in a person with cortisone reductase deficiency. Finding the exact variants allows carrier testing of relatives and informed reproductive planning.
Lifestyle risk factors
Lifestyle habits do not cause cortisone reductase deficiency, but they can meaningfully influence symptoms and complications. Choices that affect insulin resistance, body composition, and stress hormones may change the intensity of androgen-related features. Understanding how lifestyle affects Cortisone reductase deficiency can help tailor day-to-day management while medical care addresses the underlying disorder.
Excess adiposity increases insulin resistance, which can amplify adrenal androgens in CRD and worsen hirsutism or acne. Keeping a stable, healthy weight may reduce symptom intensity and improve menstrual regularity.
Frequent high-glycemic foods drive insulin spikes that can potentiate androgen excess in CRD. Emphasizing fiber-rich carbs and protein can blunt spikes and ease energy swings.
Low activity worsens insulin resistance and central fat, which can aggravate androgen-related symptoms in CRD. Regular aerobic and resistance exercise improves insulin sensitivity and may lower symptom burden.
Short or fragmented sleep heightens insulin resistance and HPA-axis reactivity, potentially increasing ACTH drive in CRD. Better sleep may lessen breakouts, hair growth, and fatigue related to androgen excess.
Risk prevention
Cortisone reductase deficiency is a genetic condition, so you can’t prevent the condition itself, but you can lower the chance of complications and catch problems early. The focus is on reducing insulin resistance, managing weight, and keeping androgen-related symptoms in check. Prevention is about lowering risk, not eliminating it completely. Early detection and regular endocrine care often make the biggest difference over time.
Learn about inheritance, carrier testing, and recurrence risk for future pregnancies. Discuss options such as prenatal or preimplantation testing if that aligns with your values.
See an endocrinology team on a set schedule to track hormones, growth, and puberty. Routine checks help adjust care before symptoms escalate.
Regular physical activity and balanced meals help improve insulin sensitivity. This can ease androgen-related symptoms in cortisone reductase deficiency.
If a glucocorticoid is prescribed, take it exactly as directed and don’t stop suddenly. Report side effects like sleep changes, mood shifts, or swelling to your clinician.
Transmission
Cortisone reductase deficiency is not contagious—you can’t catch it from someone else. It’s a genetic condition passed down in an autosomal recessive way, meaning a child needs to inherit two nonworking copies of the relevant gene, one from each parent, to have the condition.
Parents who each carry one changed copy are usually healthy carriers; with every pregnancy, there’s a 25% (1 in 4) chance the child will have cortisone reductase deficiency, a 50% chance the child will be a carrier, and a 25% chance the child will inherit neither change. Rarely, a new gene change can occur for the first time in a child, but genetic transmission of cortisone reductase deficiency most often involves carrier parents. If your family is affected, a genetics professional can explain how cortisone reductase deficiency is inherited and discuss options for testing.
When to test your genes
Consider genetic testing if you have unexplained signs of cortisol imbalance—such as early-onset androgen excess, irregular periods, infertility, or high ACTH with normal/high cortisol—especially with a family history or consanguinity. Test before starting long-term steroids or fertility treatment to guide therapy. Newborns with atypical genital development also warrant prompt testing.
Diagnosis
Diagnosis usually starts with noticing signs of excess androgens, like early pubic hair, acne, or irregular periods, and then confirming the pattern with targeted tests. Many living with cortisone reductase deficiency have normal blood cortisol levels, so doctors look for indirect clues that the body isn’t activating cortisone into cortisol properly. Getting a diagnosis is often a turning point toward answers and support. The diagnosis of cortisone reductase deficiency is based on recognizable clinical features and confirmed with specific hormone studies and genetic tests.
Doctors look for early pubic or underarm hair, rapid growth, acne, and in females, unwanted hair or irregular cycles. In males, signs may include early pubic hair and acne without true puberty. These patterns raise suspicion for cortisone reductase deficiency.
Doctors usually begin with morning cortisol, ACTH, DHEA-S, androstenedione, and testosterone. Results often show normal cortisol with high ACTH and elevated androgens. This mismatch suggests tissue-level cortisol shortage rather than classic adrenal failure.
A 24-hour urine test analyzes cortisol and cortisone breakdown products. A high cortisone-metabolite to cortisol-metabolite ratio supports cortisone reductase deficiency. This fingerprint helps separate it from more common conditions.
Dynamic testing checks how cortisol responds to injected ACTH. A normal rise helps rule out primary adrenal insufficiency despite symptoms. This context supports a defect in converting cortisone to cortisol rather than a failing adrenal gland.
Stages of Cortisone reductase deficiency
Cortisone reductase deficiency does not have defined progression stages. Different tests may be suggested to help confirm what’s going on, usually with blood and urine hormone checks that look for an imbalance between cortisol and cortisone alongside higher adrenal androgens. Early symptoms of cortisone reductase deficiency may include faster-than-expected childhood growth, early body hair or acne, and in teens or adults, irregular periods or unwanted facial hair. Diagnosis and follow-up typically involve hormone panels over time, and genetic testing can sometimes identify the underlying cause and guide care.
Outlook and prognosis
The outlook for cortisone reductase deficiency varies quite a bit from person to person. Many people ask, “What does this mean for my future?”, and the good news is that most can expect a normal life span with the right care. The main health issues tend to come from long‑term exposure to higher androgen levels and altered cortisol balance—things like early pubic hair, acne, irregular periods, reduced fertility, or metabolic strain such as weight gain, insulin resistance, and high blood pressure. Early care can make a real difference, especially when early symptoms of cortisone reductase deficiency are recognized in childhood or adolescence and treatment is tailored to hormone levels and life goals.
Prognosis refers to how a condition tends to change or stabilize over time. In cortisone reductase deficiency, hormone patterns often settle with consistent management, and many people maintain good day‑to‑day functioning, school or work routines, and family life. Fertility can be affected, but with medical treatment and timing, many achieve healthy pregnancies or father children. Serious complications are uncommon when care is consistent, though untreated metabolic problems can raise long‑term cardiovascular risks.
Looking at the long-term picture can be helpful. There isn’t strong evidence that cortisone reductase deficiency by itself increases mortality, but the downstream risks tied to metabolic health deserve attention over the years. Regular follow‑up to fine‑tune medications and monitor blood pressure, glucose, cholesterol, and reproductive health supports a favorable outlook. Talk with your doctor about what your personal outlook might look like, including plans for family building and how to adjust treatment during life stages like puberty, pregnancy, or menopause.
Long-term effects
Cortisone reductase deficiency tends to cause long-term effects related to excess adrenal androgens rather than classic cortisol crises. Many first notice issues around puberty—early symptoms of cortisone reductase deficiency can include premature body hair, acne, and fast growth. Long-term effects vary widely, and severity can shift over time. With monitoring and tailored treatment, most people do well and avoid serious complications.
Excess androgens can lead to persistent acne, unwanted facial or body hair, and scalp hair thinning. These changes may wax and wane and often need ongoing skin or hair treatments.
People with periods may have irregular cycles and trouble ovulating, which can affect fertility. With hormone management, many achieve regular cycles and successful pregnancies.
Rapid childhood growth and early pubic hair can come with an advanced bone age. Without treatment, this can shorten final adult height, while early care may help protect it.
Some develop insulin resistance and weight gain over time, especially when cycles are irregular and androgens are high. Doctors may track these changes over years to see how metabolism responds to treatment.
How is it to live with Cortisone reductase deficiency?
Day to day, cortisone reductase deficiency can feel like your energy and stress response don’t match the situation—fatigue or low mood on ordinary days, then exaggerated acne, oily skin, or irregular periods from the body’s workaround hormones. For many, the uncertainty is the hardest part: you may plan around predictable routines, carry snacks to steady energy, and check in with a clinician when stressors stack up. Partners, family, and coworkers often notice shifts in stamina or focus; understanding that this is a medical condition—not a motivation issue—helps everyone set realistic expectations and offer support. With a clear care plan and open communication, most people build steady habits that reduce flare‑ups and make room for work, school, and relationships.
Treatment and drugs
Treatment for cortisone reductase deficiency focuses on restoring healthy cortisol levels and easing day-to-day symptoms like fatigue, low blood sugar, and signs of excess androgens. Many people do well with low-dose hydrocortisone or similar cortisol replacement, timed through the day to mimic the body’s natural rhythm; a doctor may adjust your dose to balance benefits and side effects. If androgen-related features are troublesome—such as acne, excess hair growth, or irregular periods—doctors may add medicines that lower androgen effects, and in children, therapy is carefully tailored to support normal growth and puberty. Alongside medication, regular meals with balanced protein and complex carbs can help stabilize blood sugar, and periodic check-ins track growth in children and blood pressure, weight, and metabolic health in adults. Ask your doctor about the best starting point for you, especially during stress, illness, pregnancy, or surgery, when doses may need temporary changes.
Non-drug treatment
Living with cortisone reductase deficiency can affect daily energy, skin and hair, and, for some, menstrual regularity or fertility planning. Alongside medicines, non-drug therapies can support hormone balance, ease visible symptoms, and protect long-term health. These approaches focus on lifestyle, self-care, and specialist guidance. They can also help you notice early symptoms of cortisone reductase deficiency and know when to seek medical input.
Emphasize balanced meals with fiber, lean protein, and unsweetened fluids, and aim for regular physical activity most days. Staying active helps metabolic health and can support weight management.
Reaching and maintaining a healthy weight can reduce insulin resistance and lower androgen-related symptoms. Small, steady changes often work better than strict diets.
Mechanical methods like shaving, waxing, threading, or epilation can manage unwanted hair at home. Laser or intense pulsed light by trained professionals offers longer-lasting results for many people with cortisone reductase deficiency.
Gentle cleansing, non-comedogenic moisturizers, and sunscreen can support acne-prone skin. A consistent routine helps reduce irritation around hair follicles.
Your genes may have an impact on how drugs work for you
Some people with cortisone reductase deficiency process medicines differently because gene changes can speed up or slow down drug‑metabolizing enzymes, affecting dose needs and side‑effect risk. Pharmacogenetic testing and careful monitoring help tailor steroid replacement and related therapies more safely.
Pharmacological treatments
For many living with cortisone reductase deficiency, treatment aims to steady energy, clear acne, and ease excess hair growth while keeping daily life predictable. Most plans use a small dose of a glucocorticoid to quiet overactive adrenal signals and reduce androgen buildup, and some people also benefit from medicines for acne, periods, or fertility. First-line medications are those doctors usually try first, based on safety, experience, and how well they trim down the hormone imbalance. Not everyone responds to the same medication in the same way.
Often the first choice to gently lower ACTH signals and curb excess androgens. It can improve acne, scalp oiliness, and unwanted hair growth, and help steady growth in children.
A potent option sometimes used at night to blunt next-morning adrenal drive. It may suit adolescents or adults when hydrocortisone isn’t enough, but the lowest effective dose is key to avoid side effects.
An alternative glucocorticoid when hydrocortisone isn’t ideal. It can provide steadier daytime control of androgens in some people, with regular checks for weight, blood pressure, and mood.
Ethinyl estradiol with a progestin can regulate periods and lower free androgens, easing acne and hirsutism. This can be added if cycle issues or skin symptoms persist despite glucocorticoids.
Genetic influences
Cortisone reductase deficiency most often results from changes in one of two genes—HSD11B1 or H6PD—that help the body convert cortisone back into cortisol. Some conditions are passed down through families (inherited disorders). This condition is inherited in an autosomal recessive way: people usually develop symptoms only when both copies of the gene are changed, while those with one changed copy (carriers) typically feel well. If both parents are carriers, each child has a 25% chance of having cortisone reductase deficiency. Because severity can vary even within the same family, understanding the inherited pattern of cortisone reductase deficiency can help with planning and monitoring. Genetic testing of HSD11B1 and H6PD can confirm the genetic causes of cortisone reductase deficiency and identify relatives who may be carriers.
Is Cortisone reductase deficiency genetic?
Genetics are central in cortisone reductase deficiency. Most cases stem from inherited variants in enzymes that recycle cortisone to cortisol, typically passed in an autosomal recessive pattern. Different mutations can change severity, treatment response, and family recurrence risk.
Pharmacogenetics—how genetics influence drug effects
Because Cortisone reductase deficiency changes how the body turns certain steroids into their active form, treatment often focuses on using steroids that are already active. Cortisone or prednisone, which need to be converted to work fully, may not control symptoms well, so doctors usually prefer hydrocortisone or prednisolone. Genetic testing can sometimes identify how your body activates steroid “prodrugs,” helping your care team choose the form and dose most likely to work. If early symptoms of Cortisone reductase deficiency appear in childhood, doses are carefully individualized and adjusted as a child grows to avoid both under-treatment and steroid side effects. Age, weight, and other medicines still matter, so regular follow-up with lab checks and symptom tracking helps fine‑tune therapy. This is a practical use of pharmacogenetics in care: your genetic findings guide the choice of steroid and aim for the lowest effective dose.
Interactions with other conditions
People living with cortisone reductase deficiency often also face PCOS-like symptoms and metabolic concerns such as insulin resistance and weight gain. Certain diseases may “overlap,” meaning features from one condition resemble or intensify those of another. The adrenal-driven androgen excess in cortisone reductase deficiency can make acne, unwanted hair growth, and irregular periods worse, and insulin resistance can feed back to further raise androgen levels. Because of this two-way pull, clinicians usually keep an eye on blood sugar, cholesterol, and liver fat and may screen for type 2 diabetes in people with cortisone reductase deficiency, especially if obesity is present. It can be confused with, and less commonly occur alongside, true PCOS or nonclassical congenital adrenal hyperplasia, so clear diagnosis helps tailor treatment. One practical interaction to know: conversion of cortisone into active cortisol is impaired in cortisone reductase deficiency, so cortisone-based medicines for other illnesses may not work as well and alternatives like hydrocortisone are often considered.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
History
Throughout history, people have described children who grew quickly, were unusually tall for their age, or developed acne and body hair early, while lab tests later didn’t match the obvious signs of extra stress hormone activity. Families and communities once noticed patterns that seemed to “skip” a generation, with relatives sharing similar features without an obvious cause. These early observations set the stage for understanding what we now call cortisone reductase deficiency.
First described in the medical literature as a puzzling mismatch between symptoms of high cortisol and blood tests that looked low or normal, the condition challenged doctors for years. Early reports focused on teenagers with early puberty changes or women with irregular cycles and excessive hair growth, yet their cortisol levels didn’t behave as expected. Over time, descriptions became more precise as clinicians recognized a consistent pattern: the body was making cortisol, but breaking it down too quickly, pushing the system to work overtime.
As medical science evolved, researchers traced the problem not to the adrenal glands themselves, but to enzymes that recycle cortisone back into active cortisol inside tissues. This was a turning point. It explained why people with cortisone reductase deficiency could have signs of too much androgen activity—oily skin, acne, increased body hair—while standard hormone tests seemed confusing. It also clarified why some children grew fast in height early on but later settled, and why blood pressure and blood sugar findings varied from person to person.
In recent decades, knowledge has built on a long tradition of observation. Advances in genetics connected many cases to changes in genes that control these “recycling” enzymes, especially ones that act like a dimmer switch for turning cortisone back into cortisol in the liver and other tissues. This genetic link confirmed what generations of similar symptoms had hinted at—an inherited pattern, often autosomal recessive, where parents without symptoms can have a child with the condition.
Despite evolving definitions, the core story has remained consistent: a biochemical bottleneck that makes the body think cortisol is low, pushing the adrenal glands to produce more hormone signals and, as a side effect, more androgens. Looking back helps explain why early symptoms of cortisone reductase deficiency were sometimes misread as other adrenal or ovarian conditions. Today’s understanding grew from those early case notes, careful family histories, and, eventually, the genetic studies that tied the pieces together.