Neurofibromatosis Type 1–Associated Inflammatory Polyp of the Gastrointestinal Tract

The entity known as “juvenile-like (inflammatory/hyperplastic) mucosal polyps of the gastrointestinal tract in neurofibromatosis type 1 (NF1)” was recently proposed, but is not well known. Here, we describe the characteristics of this entity in a surgically resected case. The hemorrhagic 2 × 1 cm–sized polyp was resected from the ascending colon of a 55-year-old male NF1 patient. The polyp was composed of characteristic multiple mucosal protrusions and submucosal elements that included vasculopathic changes. Histologically, this lesion was similar to an inflammatory fibroid polyp rather than juvenile or hyperplastic polyps. This disease could be a distinct entity, and “inflammatory vasculopathic polyp” would be a suitable name.