A rare cause of acute urinary retention— Primary malignant melanoma of prostate

doi:10.1016/j.ajur.2019.01.003

Asian Journal of Urology, 2019, 6 (4): 380-382 doi: 10.1016/j.ajur.2019.01.003

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A rare cause of acute urinary retention— Primary malignant melanoma of prostate

Kalpesh Parmar(

),Ashish Khanna,Shrawan Kumar Singh,Manjeet Sharma

Department of Urology, PGIMER, Chandigarh, India

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Abstract

Acute urinary retention is commonly seen in elderly male patient due to benign enlargement of prostate. We report a 65-year-old male presenting with acute urinary retention diagnosed to have primary malignant melanoma of prostate. Primary malignant melanoma of genitourinary tract is very uncommon diagnosis in urology and prostate involvement is extremely rare. Till now only five cases have been reported.

Key words： Urinary retention Malignant melanoma Transurethral resection of prostate aggressive Prostate

Received: 28 December 2017 Available online: 12 January 2019

Corresponding Authors: Kalpesh Parmar E-mail: kalpesh010385@gmail.com

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Cite this article:

Kalpesh Parmar,Ashish Khanna,Shrawan Kumar Singh, et al. A rare cause of acute urinary retention— Primary malignant melanoma of prostate[J]. Asian Journal of Urology, 2019, 6(4): 380-382.

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http://www.ajurology.com/EN/10.1016/j.ajur.2019.01.003 OR http://www.ajurology.com/EN/Y2019/V6/I4/380

Dynamic contrast enhanced MRI images showing a large (8.2 cm × 6.3 cm × 5.2 cm) heterogeneous signal intensity mass lesion replacing the prostate infiltrating into the bladder base, rectum and lateral pelvic walls which appears hyper intense in the T1 weighted images (coronal [A] and axial [B] sections) and hypo intense in the T2 weighted images (C). Foleys bulb is seen in situ (B,C). MRI, magnetic resonant imaging.

¹⁸F fluorodeoxyglucose positron emission tomography scan images—maximum intensity projection image. (A) Physiological uptake of tracer uptake in the brain, myocardium, liver and the bowel with intense tracer activity in the pelvic region centred over the bladder and prostate; Axial (B) and sagital (C) views demonstrate intense fluorodeoxyglucose avid lesion (SUV max 14.2) in the prostate. SUV, standardised uptake value.

Photomicrographic images. (A) Malignant cells containing melanin arranged in sheets (H-E 40×); (B) HMB 45 staining strongly positive (IHC, 10×).

Intraoperative image. (A) Blackish prostatic tissue being resected with the loop; (B) The melanoma prostatic tissue with its characteristic blackish appearance.