is early brain-driven puberty (hypothalamic-pituitary-gonadal axis activation) in boys before age 9.

is a benign, wing-shaped conjunctival growth that can invade the cornea.

is sudden, painless vision loss in one eye; a medical emergency.

is a blockage of the main retinal vein causing sudden vision loss.

is an eye disorder where retinal fluid blurs central vision, usually temporary.

is a sleep-related breathing disorder where the brain temporarily stops signaling breathing.

is a rare skin disorder with expanding patches of fat loss.

is a rare genetic muscle disorder causing weakness and delayed motor milestones.

is a rare inherited muscle disorder causing weakness, often from birth.

is a rare inherited muscle disorder causing lifelong weakness and fatigue.

is a rare genetic muscle disorder causing weakness and low tone (hypotonia).

is a genetic muscle disease causing weakness, low tone, and delayed milestones.

is a rare inherited muscle disease causing lifelong muscle weakness and fatigue.

is a neural tube defect where brain tissue protrudes through the skull.

is an immune reaction to cephalosporin antibiotics, mild to severe.

is an itchy skin rash from parasite larvae after water exposure.

is a rare, benign cerebellar blood vessel tumor causing balance problems.

is a usually slow-growing cerebellar brain tumor, commonly affecting children and teens.

is a disorder causing poor coordination, balance, and speech from cerebellar dysfunction.

is a rare genetic brain disorder causing progressive balance and coordination problems.

is a genetic neurological disorder causing progressive balance, coordination, and speech problems.

is a rare inherited disorder causing progressive balance and coordination problems.

is a progressive nerve and balance disorder causing unsteady gait and dizziness.

is a progressive disorder causing coordination problems (ataxia) and nerve damage (neuropathy).