J Korean Soc Radiol.  2017 Feb;76(2):91-95. 10.3348/jksr.2017.76.2.91.

Ectopic Prostatic Tissue in the Rectum: A Case Report

Affiliations
  • 1Department of Radiology, Presbyterian Medical Center, Jeonju, Korea. chickh@nate.com
  • 2Department of Pathology, Presbyterian Medical Center, Jeonju, Korea.

Abstract

Ectopic prostatic tissue (EPT) outside the male genitourinary tract is an unusual finding, and it is very rarely found in the rectum or around the peri-rectal region. In addition, the radiologic features of EPT are seldom reported. Also, it is difficult to differentiate EPT found in the rectal subepithelium from the other types of subepithelial tumors. We present here a unique case of EPT found in the retrorectal region, along with the radiologic findings of transrectal ultrasonography, computed tomography, and magnetic resonance imaging with their pathologic correlations.


MeSH Terms

Choristoma
Humans
Magnetic Resonance Imaging
Male
Multidetector Computed Tomography
Prostate
Rectal Diseases
Rectum*
Ultrasonography

Figure

  • Fig. 1 A 46-year-old man with subepithelial ectopic prostatic tissue in the rectum. A. Colonoscopic image shows an approximately 25 mm sized, round, sessile polypoid mass with smooth margins, covered with normal rectal mucosa (arrow). B, C. An axial precontrast CT scan (B) shows an ill-defined posterior perirectal mass (arrowhead) with a focal nodular high density toward the rectal lumen (arrow) on the anterior side of the mass, and an axial contrast enhanced CT scan during the portal phase (C) shows heterogeneous enhancement of the mass (arrowhead). D. Endoscopic ultrasound shows a poorly-marginated hypoechoic mass (arrowhead) with a partial septated cystic area (arrow) in the 4th layer (muscularis propria) of the rectum and perirectal space. CT = computed tomography

  • Fig. 2 MRI findings of subepithelial ectopic prostatic tissue in the rectum. A, B. Axial T1WI (A) and axial T2WI (B) show a mass extending across the posterior rectal wall and the presacral space with a complex cystic and solid nature. The cystic portion of the mass (arrows) shows high signal intensity on a T1WI and dark signal intensity on a T2WI. The solid portion (arrowhead) shows low signal intensity on a T1WI and high signal intensity on a T2WI. C. Subtraction image shows no enhancement in the cystic portion of the mass and heterogeneous enhancement in the solid portion of the mass (arrowhead). D. On the diffusion-weighted image with a b-value of 800, diffusion restriction was not observed in the solid portion of the mass (arrowhead). MRI = magnetic resonance imaging, T1WI = T1-weighted image, T2WI = T2-weighted image

  • Fig. 3 Histopathologic findings of a surgical specimen in a 46-year-old man with subepithelial ectopic prostatic tissue in the rectum. Immunohistochemical staining for prostate-specific antigen demonstrates light brown colored glandular epithelia (× 200).


Cited by  1 articles

A Rare Case of Zinner's Syndrome with Ectopic Prostate and Triorchidism
Ara Ko, Eun Sun Lee, Hyun Jeong Park, Jong Beum Lee, Byung Ihn Choi
J Korean Soc Radiol. 2018;78(5):358-362.    doi: 10.3348/jksr.2018.78.5.358.


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