Benign tumors

Reviewer: Jaleh Mansouri, M.D. (see Authors page)

Revised: 1 November 2017, last major update August 2012

Copyright: (c) 2003-2017,, Inc.

PubMed Search: Mucocele appendix
Cite this page: Mucocele. website. Accessed July 16th, 2018.
Definition / general
  • Grossly dilated appendix filled with mucus
  • Clinical but not a histologic diagnosis

    • Hyperplastic polyp (similar to colonic polyp)
    • Mucinous neoplasm (LAMN and HAMN) (most common)
    • Mucinous cystadenocarcinoma
    • Simple mucocele (below)
    • Obstruction from endometriosis
    • Inspissated mucus (cystic fibrosis)
  • Gross description
  • Nonneoplastic mucoceles usually 1 cm or less
  • Microscopic (histologic) description
  • Dilatation of lumen by tenacious mucinous secretion
  • Thin appendiceal wall
  • Dysplastic epithelium in neoplastic lesions, mucin may dissect into wall