Fallopian tubes & broad ligament

Fallopian tube tumors

Adenomatoid tumor

Topic Completed: 1 September 2013

Minor changes: 30 December 2020

Copyright: 2002-2021, PathologyOutlines.com, Inc.

PubMed Search: Adenomatoid tumor fallopian tubes

Nicole Riddle, M.D.
Jamie Shutter, M.D.
Page views in 2020: 3,685
Page views in 2021 to date: 3,624
Cite this page: Riddle N, Shutter J. Adenomatoid tumor. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/fallopiantubesadenomatoid.html. Accessed October 18th, 2021.
Definition / general
  • Most common benign fallopian tube tumor, usually asymptomatic
  • Also called benign mesothelioma
  • Often occurs in middle aged or older females
  • May be due to invaginations of visceral mesothelium
  • Uterus, ovary, para-ovarian
  • Similar behavior as tumor in paratesticular region
Gross description
  • Usually incidental, unilateral, microscopic finding within myosalpinx (muscle layer)
  • May be circumscribed, gray white yellow, firm nodule up to 3 cm
Gross images

AFIP images

Well circumscribed mass

Microscopic (histologic) description
  • Usually tubular spaces of varying size composed of flattened cells resembling endothelium
  • Rarely large cells with eosinophilic cytoplasm
  • Often with smooth muscle hyperplasia, lymphocytic follicles
  • May have cytoplasmic vacuoles, infiltrative-like borders, clusters or small cords of cells
  • Rare mitotic figures, minimal atypia
  • May resemble vacuoles, fat cells, vessels, artifact
Microscopic (histologic) images

AFIP images

Tubal wall expanded

Slit-like, gland-like structures

Cysts are conspicuous

Vacuoles and gland-like spaces

Abundant eosinophilic cytoplasm with few vacuoles

Vacuoles and
spaces separated
by scanty stroma

Images hosted on other servers:

Tubule-like spaces lined by flattened cells

Numerous tubular
vascular spaces

Flattened lining

Negative stains
Differential diagnosis
  • Adenomyoma: more prominent smooth muscle
  • Invasive / metastatic well differentiated carcinoma: not circumscribed, more atypia and mitotic activity, different immunohistochemical profile
  • Lymphangioma: cells very flattened, calretinin-
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