Urethral Mucinous Adenocarcinoma of the Prostate: An Uncommon and Diagnostically Complex Disease.

A 66-year-old male presented with hematuria and mucosuria. A transurethral resection of the prostate revealed adenocarcinoma in situ with mucinous features. He underwent a robotic-assisted radical prostatectomy with lymph node dissection. Pathology confirmed T2 primary mucin-producing urothelial type adenocarcinoma in the prostatic urethra. Urothelial adenocarcinoma arising in the prostatic urethra is an uncommon disease that warrants clear differentiation from other malignancies due to its aggressive nature. The differential includes urologic and gastrointestinal malignancies making diagnosis complex. Accurate diagnosis is critical to providing appropriate treatment as these patients are at high risk of developing recurrence and metastatic disease.