Testis & paratestis

Ovarian type tumors

Mucinous borderline tumor

Last author update: 1 January 2014
Last staff update: 6 January 2021

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PubMed Search: borderline mucinous tumor [title]

Jennifer Gordetsky, M.D.
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Cite this page: Gordetsky J. Mucinous borderline tumor. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/testisborderline.html. Accessed September 22nd, 2023.
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

Images hosted on other servers:

Area of curvilinear calcification

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

Positive stains
Differential diagnosis
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