Abstract
Ectopic prostatic tissue is an underreported entity, which is found most commonly in the lower male genitourinary tract, and ectopic prostate tissue outside the urinary tract is even rarer. Our patient was a unique case of ectopic prostatic tissue within submucosa of the rectum. The patient presented with rectal bleeding, and a firm, round solid submucosa nodule found in the anterior rectum at digital rectal examination, it was 1cm in diameter and 5cm above the anal verge. The size and submucosa location of this nodule were confirmed by the colonoscopy and MRI. After being removed surgically, the histopathology of the specimen sections possessed typical prostatic acini and stroma, meanwhile the immunohistochemical staining for prostate specific antigen confirmed its' prostatic nature. It is the first case to date, which involves the mural of rectum. We hypothesizes that the etiologies of ectopic prostatic tissue within the submucosa rectum attribute to embryogenetic abnormality.
Highlights
Ectopic prostatic tissue is a relatively uncommon but interesting phenomenon which is most commonly encountered in the lower male urinary tract.[1,2]
Most cases occur in male urinary tract, as a recognized cause of asymptomatic hematuria, which are found most commonly in the prostatic urethra near the verumontanum.[5]
Ectopic prostate tissue has previously been reported in the lower gastrointestinal tract such as anal canal.[4,7]
Summary
Ectopic prostatic tissue is a relatively uncommon but interesting phenomenon which is most commonly encountered in the lower male urinary tract.[1,2] ectopic prostate tissue outside the urinary tract is even a rarer occurrence. Ectopic prostatic tissue is usually found incidentally but has been a cause of lower gastrointestinal bleeding, obstructive symptoms, or a retroperitoneal mass.[2,3,4] Review of literature revealed variably sized lesions of ectopic prostate tissue involving a variety of. August 5, 2013 September 8, 2013 organs outside the urinary tract, including pericolic fat, anal canal, uterine cervix, spleen, and seminal vesicle.[2,3,4,5,6,7,8,9] The ectopic location might be related to the abnormal embryogenesis or divergent differentiation of the prostate, rectum, and bladder.[3]
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