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Diagnostic Pathology
Published in: Diagnostic Pathology 1/2017

Open Access 01-12-2017 | Case Report

Clinicopathological study of 9 cases of prostate cancer involving the rectal wall

Authors: Tao Tang, Zhengduo Yang, Dan Zhang, Jie Qu, Guang Liu, Shiwu Zhang

Published in: Diagnostic Pathology | Issue 1/2017

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Abstract

Background

Prostate cancer involving the rectal wall is rare and may lead to diagnostic pitfalls.

Case presentation

Out of 9504 patients with rectal tumors between January 2003 and January 2015, 9 patients (elderly with a mean age of 74 years) with prostate cancer involving the rectal wall were clinically misdiagnosed with rectal cancer. The lesions were located in the rectum, and included 3 circumferential rectal masses, 1 ulceration lesion, 1 crater-like mass, and 4 protruding lesions. Specimens were acquired using biopsy, fine needle aspiration, or resection. The initial symptoms of these patients included rectal urgency, bowel obstruction, and lower gastrointestinal bleeding. Prostate-related symptoms were not obvious. Histologically, 2 cases showed cancer cell invasion in the mucosa, 1 showed transmural invasion from the mucosa to subserosal soft tissues, and 7 cases had submucosa and muscularis propria involvement. All the 9 cases had muscularis propria involvement. However, there were no intraepithelial neoplasias in the mucosal layer, which is reminiscent of rectal carcinoma. The tumors consisted of small-sized or foamy cells that formed acinus-like, duct-like, and cribriform-like structures. We conducted histological staining and an immunohistochemical analysis for CDX-2, prostate-specific antigen (PSA), P504s, villin, carcinoembryonic antigen, CK-pan, cytokeratin 20, and Ki-67. All tumors were PSA and CK-pan positive, 5 of 9 tumors were P504s-positive, and all tumors were negative for the other markers. All patients underwent standard therapy for prostate cancer after the definitive pathological diagnosis. As of March 31, 2015, 8 patients were alive and 1 had died of prostate cancer 6 months posttreatment.

Conclusions

Adenocarcinoma appearing in the rectal wall is not always rectal carcinoma. It is necessary to perform a differential diagnosis for prostate cancer in cases of rectal malignant tumors in elderly male patients. Any treatment should be postponed until the final definitive diagnosis is reached.
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Metadata
Title
Clinicopathological study of 9 cases of prostate cancer involving the rectal wall
Authors
Tao Tang
Zhengduo Yang
Dan Zhang
Jie Qu
Guang Liu
Shiwu Zhang
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Diagnostic Pathology / Issue 1/2017
Electronic ISSN: 1746-1596
DOI
https://doi.org/10.1186/s13000-017-0599-2

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