Neurofibromatosis-associated Gastrointestinal Stromal Tumor Causing Small Bowel Obstruction.

Multiple gastrointestinal stromal tumors (GISTs) of the small intestine is an uncommon finding but can be a marker for underlying neurofibromatosis type 1 (NF1). We present the case of the 38-year-old male without prior NF1 diagnosis who presented with a small bowel obstruction. His physical exam was notable for cutaneous nodules and café-au-lait spots. He progressed to peritonitis and underwent an exploratory laparotomy, which revealed a 6-cm hemorrhagic mass along the antimesenteric border of the jejunum, causing obstruction and perforation. Pathology was consistent with GISTs. NF1-associated GISTs differ from wild-type GISTs in that they are unlikely to have C-KIT and PDGFRA mutations and therefore do not respond to imatinib. Treatment is largely limited to surgical resection; however, there is evidence that MEK inhibitors may prove an additional treatment strategy.