Appendix
Benign tumors
Mucocele

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

Revised: 23 February 2016, last major update August 2012

Copyright: (c) 2003-2016, PathologyOutlines.com, Inc.

PubMed Search: Mucocele appendix
General
  • Grossly dilated appendix filled with mucus
  • Clinical but not a histologic diagnosis

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