Synchronous Ascending Colon Adenocarcinoma and Terminal Ileal Carcinoid Tumor Presenting With Ileocecal Intussusception: A Case Report.

Synchronous occurrences of colorectal adenocarcinoma and gastrointestinal carcinoid tumors are rare, presenting unique diagnostic and therapeutic challenges. This report describes an 81-year-old female who developed ileocecal intussusception secondary to concurrent cecal adenocarcinoma and a carcinoid tumor in the terminal ileum. The patient underwent a right hemicolectomy with primary anastomosis, and histopathology confirmed an intramucosal adenocarcinoma within a giant tubular adenoma and a separate carcinoid tumor. Postoperative recovery was uneventful, with subsequent colonoscopy revealing benign polyps. This report highlights the importance of thorough preoperative assessment, surgical management, and vigilant postoperative surveillance in patients with synchronous malignancies.