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.