Fallopian tubes
Tumors
Adenomatoid tumor


Topic Completed: 1 September 2013

Revised: 13 December 2019

Copyright: (c) 2002-2019, PathologyOutlines.com, Inc.

PubMed Search: Adenomatoid tumor fallopian tubes

Nicole Riddle, M.D.
Jamie Shutter, M.D.
Page views in 2018: 2,908
Page views in 2019 to date: 3,337
Cite this page: Riddle N, Shutter J. Adenomatoid tumor. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/fallopiantubesadenomatoid.html. Accessed December 15th, 2019.
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
Sites
  • 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
gland-like
spaces separated
by scanty stroma



Images hosted on other servers:

Tubule-like spaces lined by flattened cells

Numerous tubular
structures
mimicking
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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