Appendix
Benign tumors
Mucocele



Topic Completed: 1 August 2012

Revised: 29 April 2019

Revised: 23 January 2019

Copyright: (c) 2003-2019, PathologyOutlines.com, Inc.

PubMed Search: Mucocele appendix


Jaleh Mansouri, M.D., M.P.H.
Page views in 2018: 8,855
Page views in 2019 to date: 4,252
Cite this page: Mansouri J. Mucocele. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/appendixmucocele.html. Accessed June 19th, 2019.
Definition / general
  • Grossly dilated appendix filled with mucus
  • Clinical but not a histologic diagnosis

    Causes:
    • 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
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