Testis and epididymis
Paratesticular tumors
Mucinous borderline tumor

Topic Completed: 1 January 2014

Minor changes: 28 March 2019

Copyright: 2003-2017, PathologyOutlines.com, Inc.

PubMed Search: borderline mucinous tumor [title]

Jennifer Gordetsky, M.D.
Page views in 2019: 335
Page views in 2020 to date: 291
Cite this page: Gordetsky J. Mucinous borderline tumor. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/testisborderline.html. Accessed June 7th, 2020.
Definition / general
  • Primary mucinous tumor of ovarian type surface epithelium with borderline malignant potential
  • Intratesticular or paratesticular
  • The histogenesis of the ovarian type surface epithelial tumors of the testis and paratestis remains unclear
  • These tumors are possibly derived from Müllerian remnants or by metaplasia of the mesothelium of the tunica vaginalis (Hum Pathol 2011;42:1343)
  • Clinical evaluation is necessary to rule out metastatic spread from a primary adenocarcinoma of the appendix, colon, stomach, pancreas, lung or prostate
Case reports
  • Radical orchiectomy
Clinical images

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Area of curvilinear calcification

Gross description
  • Paratesticular or intratesticular mucinous cystic mass, most often unilocular
  • Generally not as large as the ovarian tumor counterpart
Gross images

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Multicystic central area and solid periphery

Microscopic (histologic) description
  • Unilocular or multilocular cystic spaces lined by either endocervical or intestinal type mucinous epithelium
  • Tufting and pseudostratification of cells with mild to severe nuclear atypia
  • Occasional papillae
  • Occasional mitotic figures
  • Goblet cells are common
  • Mucin extravasation and an associated fibrotic, calcific reaction with foci of dystrophic calcification and ossification
  • Intracystic complex architecture diagnostic of intraepithelial carcinoma as well as foci of microinvasion have been reported
  • No intratubular germ cell neoplasia (Am J Surg Pathol 2003;27:1221, Can Urol Assoc J 2010;4:E112)
Microscopic (histologic) images

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Various images

Multicystic area

Mucinous epithelium

Solid portion of tumor

Nonfibrosed area

Positive stains
Differential diagnosis
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