[Peristomal pyoderma gangrenosum in a patient with ulcero-hemorrhagic rectocolitis].

Cutaneous manifestations of chronic ulcerative colitis are numerous and present in 20 p. 100 of the patients. The case of a 49-year old man with peristomal pyoderma gangrenosum (PG) is presented. In November, 1983, one year after the onset of chronic ulcerative colitis, the patient underwent total colectomy. The formation of an ileal reservoir resulted in a pelvic abscess which necessitated right lower ileostomy. Because of severe ulcerations around the stoma, the ileostomy was transferred to the left lower abdomen. Similar inflammatory ulcerations developed, and the diagnosis of pyoderma gangrenosum was made. The patient responded very well to dapsone combined with prednisone for only 6 months. The possibility of PG being an autoimmune condition is discussed, as well as the differential diagnosis. The several therapeutic approaches are summarized. The peristomal localization of PG in this patient suffering from chronic ulcerative colitis seems to be rather unique. No other case has been reported so far, to our knowledge.