Erythema elevatum diutinum in a patient with Crohn's disease.

A possible association between erythema elevatum diutinum and Crohn's disease is described. To our knowledge, erythema elevation diutinum has never been reported in a patient with Crohn's disease, nor has the disorder been considered one of the cutaneous manifestations of inflammatory bowel disease. Erythema elevatum diutinum is believed to be mediated by the deposition of circulating immune complexes in the dermal perivascular spaces. Our patient showed clinical and histopathologic findings typical of both erythema elevatum diutinum and Crohn's disease. The patient also had a positive Raji cell assay, which demonstrates the presence of a circulating immune complex. Increased levels of circulating immune complexes have been found in patients with inflammatory bowel disease, and the gastrointestinal inflammation in Crohn's disease could lead to enhanced antigenic exposure and increased formation of immune complexes. We contend that inflammatory bowel disease may have contributed to the development of erythema elevatum diutinum in our patient.