is a rare inherited brain vessel disease causing strokes and dementia.

is a severe inherited disorder affecting the brain, eyes, and heart.

is a rare genetic condition that can affect multiple body systems.

is a rare condition causing reversible joint deformities, often after inflammation.

is a rare genetic disorder affecting skull and foot development.

is a rare genetic condition causing developmental delays and birth defects.

is a rare inherited disorder affecting the eyes and tooth enamel.

is a rare genetic bone disorder causing short stature and skeletal changes.

is a rare immune disorder causing severe infections from early infancy.

is a mosquito-borne viral brain infection that can sometimes be severe.

is a rare tick-borne infection causing fever, rash, and feeling unwell.

is a rare cancer that starts in the jawbone or nearby tissues.

is a rare eyelid condition causing drooping and involuntary eyelid movement.

is a rare inherited disorder affecting development and multiple body systems.

is an epilepsy syndrome causing brief eyelid jerks, often triggered by light.

is a rare small bowel cancer that starts in the jejunum.

is a growth in the small intestine that may be cancerous.

is a rare small-intestine cancer that may release hormone-like substances.

is a rare small-intestine neuroendocrine tumor that may produce excess somatostatin.

is inflammation of the small intestine that can cause pain and diarrhea.

is a genetic disorder causing hearing loss and dangerous heart rhythm problems.

is a rare inherited disorder causing deafness and dangerous heart rhythm problems.

is a rare, harmless skin condition causing red, raised patches.

is a rare genetic disorder affecting chest, bones, and sometimes kidneys.