A case of pellagra associated with megaduodenum in a young woman.

Pellagra is a rare condition that has been known for many years to be related to niacin deficiency. Clinically known as the 4 "D" symptoms for dermatitis, diarrhea, dementia, and even death, skin changes remain one of the most important features of this pathology, leading frequently to the diagnosis. Pellagra is mostly seen in poor populations with a deficient diet; still, it is sporadically observed in developed countries, usually in association with digestive disorders.