Korsakoff syndrome is a chronic, long-lasting brain disorder that develops when the body has been severely short of vitamin B-1 (thiamine) for an extended ...

Kohlschütter–Tönz Syndrome (OMIM #226750) is an ultra-rare, autosomal-recessive neurodevelopmental disorder first described in a Swiss family in 1974. Fewer ...

Klüver–Bucy syndrome is a rare neuro-behavioral disorder that appears when both medial temporal lobes—especially the amygdala and hippocampus—are damaged by ...

Karak syndrome is an ultra-rare, inherited neurological disease in which toxic amounts of iron build up in deep brain structures—especially the basal ganglia ...

Vernet syndrome, also known as jugular foramen syndrome, is a rare disorder that happens when the group of nerves that travel through a key opening in the ...

Jugular bulb thrombosis is a blood-clotting disorder that blocks the venous “bulb” where the sigmoid sinus drains into the upper internal jugular vein at the ...

Villaret Syndrome is a rare but striking neurological condition in which a single injury sitting deep inside the upper neck—the retro-parotid (parapharyngeal) ...

Collet-Sicard syndrome (CSS) is a rare but dramatic neurological disorder in which all four “lower” cranial nerves—IX (glossopharyngeal), X (vagus), XI ...

Jugular foramen syndrome (JFS), often called Vernet syndrome, is a rare skull-base condition in which anything that irritates or squashes the jugular ...

Joubert syndrome (JS) is a rare, inherited condition in which the back part of a baby’s brain—the cerebellar vermis—and the adjoining brain-stem fail to finish ...

Jaffe–Campanacci syndrome (JCS) is an extremely rare bone-and-skin condition in which a child or young adult develops many non-ossifying fibromas—soft, fibrous ...

Incontinentia pigmenti (IP) is a rare, X-linked dominant genetic condition that mainly affects girls because boys who inherit the faulty gene (IKBKG/NEMO) ...

Horner’s syndrome (sometimes called oculosympathetic paresis) is a cluster of eye- and face-related changes that appear when the three-neuron sympathetic nerve ...

Hereditary hemorrhagic telangiectasia—also called Osler-Weber-Rendu disease—is a rare, lifelong, inherited condition that makes some blood vessels grow in an ...

Hemimegalencephaly (HME) is a rare birth defect in which one half of the brain grows abnormally large and disorganized. The over-growth distorts the normal ...

Heerfordt syndrome is a rare, face-and-eye-centred form of the systemic disease sarcoidosis. In sarcoidosis the body’s immune system builds tiny clusters of ...