Intussusception with incarceration of a cystadenoma of the appendix

Abstract

Fifty benign epithelial neoplasms were encountered during the examination of more than 30,000 appendectomy specimens in the Laboratory of Surgical Pathology, Columbia University. In 44 cases, the neoplasms were papillary cystadenomas; in 11 of these cases, there were complications, all thought to have been caused by abnormal accumulations of mucus. We have reported a unique case of an incarcerated intussusception, and attempted to explain the pathogenesis of this unusual complication. We have also summarized the existing medical literature on the subject of intussusception of adenomatous lesions of the appendix.

Intussusception of the Appendix: Another Poorly Recognized Cause of Rectal Bleeding

“…Appendiceal intussusception can be secondary to various pathophysiologic lesions, such as polyps (26,27), Peutz–Jeghers syndrome (28,29), mucocele (30), villous adenoma (31,32), mucinous cystadenoma (33–37), adenocarcinoma (38), carcinoid (39), endometriosis (15–24,40–42), fecaliths, helminthiasis, foreign bodies, follicular lymphoid hyperplasia, enteric infections such as adenovirus (43,44), Crohn's disease (45), and cystic fibrosis (5).…”

Complete appendiceal inversion with local high-grade intraepithelial neoplasia in an adult female: a case report

“…Although computed tomography (CT) and colonoscopy may detect the condition, most reported cases have been misdiagnosed as appendicitis or ileocecal tumor, with the true diagnosis made only during or after surgery [2, 3]. Neoplasia of the appendix is another distinctly rare condition, with a reported incidence of only 0.08% [4, 5]. The combination of both appendiceal neoplasia and inversion, however, is extremely rare.…”