Because Crohn's disease has a tendency to be transmural and to form fistulas, it may involve contiguous organs. Gynecologic involvement is frequent, diverse and often difficult to diagnose. Inflammation involving adjacent structures has been reported in as many as one third of patients. Enteric fistulas to the vagina, uterus, ovaries, perineum and vulva also have been reported. Diagnosis may not be obvious if pelvic involvement precedes active bowel disease, or if drainage is clear or mucoid. Abscesses, draining sinuses, edema and ulceration of the perineum or vulva are common, and are caused by direct extension from the involved bowel or by granulomas separated from the bowel by normal tissue. Lesions presenting with vulvar hypertrophy, a fluctuant mass or ulceration are easily misdiagnosed. Menstrual abnormalities are reported in more than one half of patients. Pelvic manifestations of Crohn's disease can be psychologically crippling. Patients or physicians may be hesitant to address serious psychosocial morbidity. To optimize management, physicians must be aware of the diverse manifestations, confusing presentations and psychologic morbidity of Crohn's disease.