is a rare genetic disorder causing joint webs and anesthesia reactions.

is a lifelong immune condition affecting brain and spinal cord, disrupting nerves.

is a rare form of multiple sclerosis with somewhat different symptoms.

is a rare inherited condition affecting skin, nerves, and blood clotting.

is a rare inherited skin disorder causing recurring tumors that heal spontaneously.

is a usually slow-growing tumor affecting the tissues at the skull base.

involves multiple usually benign tumors around the spinal cord and canal.

is a rare inherited condition causing progressive brain, skin, and organ problems.

is a rare disorder causing symmetric noncancerous fatty growths around the neck.

is a rare genetic disorder causing progressive fusion of multiple joints.

is a rare genetic disorder causing progressive joint fusion and hearing loss.

is a rare genetic disorder causing joint fusions (synostoses) and hearing loss.

is a rare genetic condition causing joint fusions (synostoses) and hearing loss.

is a rare genetic disorder causing joint fusion and sometimes hearing loss.

is a rare neurodegenerative disorder affecting movement, balance, and automatic body functions.

is a rare brain disorder causing worsening balance, coordination, and autonomic problems.

is a rare brain disorder causing movement problems and autonomic failure.

is an inherited condition causing several congenital heart structure abnormalities.

is a rare, serious post-COVID illness causing widespread inflammation in children.

is a rare, serious inflammatory condition affecting multiple organs after infection.

is a rare inherited disorder affecting muscles, bones, and the brain.

is a rare genetic disorder affecting blood vessels, eyes, and other organs.

is a contagious viral illness causing swollen salivary glands and fever, vaccine-preventable.

is a form of abuse where a caregiver causes or fabricates illness.