Benign tumors


Topic Completed: 1 August 2012

Minor changes: 20 August 2019

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

PubMed Search: Mucocele appendix

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Cite this page: Mansouri J. Mucocele. website. Accessed October 18th, 2021.
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
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