is a brain development disorder affecting one side of the brain.

is a rare eye cancer affecting one eye, usually in young children.

occurs when both X chromosomes come from one parent.

is a rare congenital heart defect with only one working ventricle.

is a congenital heart defect where one pumping chamber does most work.

is a group of childhood joint disorders causing inflammation, pain, and stiffness.

is a genetic condition affecting how cells make energy.

is a rare inherited blood disorder causing unstable hemoglobin and anemia.

is a rare inherited epilepsy causing muscle jerks and seizures.

is a rare inherited brain disorder causing movement problems and cognitive decline.

is a usually benign skull-base tumor that can press on nerves.

is a rare mouth cancer affecting the upper gums and nearby tissues.

is a rare genetic condition affecting the arms, eyes, and ears.

is a condition causing overgrowth of one or both arms.

is a rare genetic condition causing shortened forearms and sometimes other differences.

is a cancer that begins in the upper lip tissues.

is an illness affecting the nose, sinuses, throat, or voice box.

is a rare cancer of the kidney lining or ureter.

is a fluid-filled pocket between the bladder and belly button.

is a pouch extending from the bladder through a urachal remnant.

is a rare birth defect leaving a tract near the belly button.

is a rare cancer starting between the bladder and belly button.

is a rare genetic condition that affects development and body systems.

is an inherited disorder that causes dangerous ammonia buildup in the blood.