Metastatic Crohn's disease responding to metronidazole.

Metastatic Crohn's disease is a rare cutaneous manifestation of intestinal Crohn's disease, for which existing treatment is unsatisfactory. We report a case of perianal and vulval Crohn's disease which cleared completely on a 4-month course of metronidazole without adverse effects. The patient remained in remission I year later. The merits of long-term treatment with metronidazole are discussed.