NCIt definition : A rare disorder of unknown etiology. It may present as a cutaneous disorder with a
benign clinical course or a systemic disorder with a grim prognosis. Both the cutaneous
and systemic variants are characterized by the presence of papular skin lesions. The
systemic variant, in addition to the skin papules, is characterized by gastrointestinal
manifestations including abdominal pain and distention, nausea, vomiting, diarrhea,
intestinal infarction, and intestinal perforation. The central and peripheral nervous
systems may also be involved in the systemic variant.;