Epstein–Barr virus‐positive mucocutaneous ulcer with a background of Crohn's disease and Waldenström macroglobulinaemia: a case report highlighting diagnostic pitfalls
1. Histopathology Department, The Royal Marsden Hospital, Sutton, Surrey, UK;2. Head and Neck Unit, The Royal Marsden Hospital, London, UK;3. Histopathology Department, The Royal Marsden Hospital, London, UK