Incidentally Detected Low-Grade Appendiceal Mucinous Neoplasm Following Laparoscopic Appendectomy for Acute Appendicitis.

Appendiceal mucinous neoplasms are rare entities that account for a small proportion of all gastrointestinal malignancies and are most often discovered incidentally on histopathological examination of appendectomy specimens. We present the case of a 36-year-old woman who presented to the emergency department with acute right lower quadrant abdominal pain and was found to have acute appendicitis on computed tomography imaging. She underwent an uncomplicated laparoscopic appendectomy, and final pathology revealed a low-grade appendiceal mucinous neoplasm (LAMN) confined to the appendix, staged as pTis(LAMN). Postoperative colonoscopy was performed to evaluate the appendiceal orifice and exclude synchronous colorectal lesions. This case highlights the importance of routine histopathological examination of all appendectomy specimens and the need for appropriate postoperative surveillance in patients with incidentally discovered appendiceal mucinous neoplasms.