Multifocal Epstein-Barr Virus-Positive Mucocutaneous Ulcers in a Patient With Crohn's Disease.

Epstein-Barr Virus-positive mucocutaneous ulcer (EBVMCU) is a rare and new category of mature B-cell neoplasms commonly linked to immunosuppression. It often has a benign course and regresses spontaneously after discontinuation or dose reduction of immunosuppressive agents. We report the case of a 48-year-old woman on long-term azathioprine therapy for rectosigmoid Crohn's disease. In contrast to the prevalent sites typically associated with EBVMCU, such as the oral mucosa and skin, this patient was found to have locations in the gastrointestinal tract and upper neck. These areas tested positive for histopathology consistent with EBVMCU and were excised due to bowel perforation and concern for malignancy.