Uncommon cause of acute abdomen in adult patient

A 41-year-old woman presented with acute abdominal pain, constipation and vomiting. Past history included immunotherapy for metastatic lymphnodes in the right axilla from metastatic melanoma of unknown primary for 20 months. No clinical response occurred and chemotherapy with carboplatin and placitaxel was performed for 4 months obtaining stable disease. At admission, physical examination revealed acute abdomen with pain, distension and absent bowel sounds. Laboratory tests were unremarkable. Computed tomography (CT) scan showed ileocolic invagination with dilated proximal small bowel (Fig. 1)