Primary clear cell adenocarcinoma of prostate: A diagnostic challenge.

Clear cell adenocarcinoma (CCA) rarely occurs in men, not to mention in prostate. We reported a 44-year-old male patient who suffered from recurrent dysuria and frequency for 6 months. Transurethral resection of the prostate was performed to relieve bladder outlet obstruction. However, CCA of the prostate was confirmed through pathological examination. A thorough checkup was performed to distinguish it from metastatic clear cell carcinoma from other primary origins. Currently, no consensus for the treatment of CCA of the prostate has been reached. After discussing with the patient, he decided to receive immunotherapy with pembrolizumab. Herein, we reported this rare case of CCA in the prostate.