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Appendix

Benign tumors

Mucocele

Reviewer: Jaleh Mansouri, M.D. (see Reviewers page)
Revised: 21 October 2012, last major update August 2012
Copyright: (c) 2003-2012, PathologyOutlines.com, Inc.

General
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● Grossly dilated appendix filled with mucus
● Clinical but not a histologic diagnosis

Causes
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● Hyperplastic polyp (similar to colonic polyp)
● Mucinous cystadenoma (most common)
● Mucinous cystadenocarcinoma
● Simple mucocele (below)
● Obstruction from endometriosis
● Inspissated mucus (cystic fibrosis)

Gross description
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● Nonneoplastic mucoceles usually 1 cm or less

Micro description
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● Dilatation of lumen by tenacious mucinous secretion
● Thin appendiceal wall
● Dysplastic epithelium in neoplastic lesions, mucin may dissect into wall

End of Appendix > Benign tumors > Mucocele

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