is an uncommon growth under or around a fingernail or toenail.

is a rare group of diseases involving abnormal, uncontrolled cell growth.

is a rare tumor affecting the nervous system, including brain or nerves.

is a rare neurodegenerative disease that progressively damages the brain.

is a rare condition causing brain or nerve inflammation from immune system problems.

is a rare neurologic disease that affects the brain and nerves.

is a rare neurologic disease that can affect mood and thinking.

is a rare nerve and muscle disorder affecting eye movement and alignment.

is a rare, usually harmless birthmark made of extra pigment cells.

is a rare inherited cause of high aldosterone and hard-to-treat hypertension.

includes uncommon breast conditions without structural breast changes.

includes uncommon conditions affecting the female reproductive system or pregnancy.

is a rare condition affecting the uterus and nearby reproductive tissues.

is a rare disease affecting the uterus, vagina, or vulva without malformations.

is a rare condition causing lifelong intellectual disability without other syndrome features.

is a rare disorder affecting eye movement or how the eyes align.

is a condition affecting eye movement, eyelid lifting, and sometimes pupils.

is a rare disorder affecting the teeth, gums, or nearby tissues.

is a rare tumor that forms from tooth-developing tissues in the jaw.

is a group of uncommon conditions affecting teeth, gums, or oral development.

is a rare eye disorder that can affect vision and eye development.

is a rare eye disorder that can also affect the brain's cortex.

is a rare eye disorder that can also affect certain cranial nerves.

is an uncommon condition that damages the optic nerve and vision.