The objective of this study was to report the diagnosis and treatment results of primary prostate adenocarcinoma (PRAD) concurrent in a patient with renal cell carcinoma (RCC), and to review the relative literature. A 62-year-old man was admitted to our hospital with chief complaint of a painless, incidentally found renal mass for one year. RCC was initially found by computed tomography (CT) scan, but prostate cancer was incidentally found by abnormal prostate-specific antigen (PSA) level results. The post-nephrectomy pathology assay reported clear RCC with positive staining of vimentin, cluster of differentiation 10 (CD10), carbonic anhydrase IX (CA-IX), paired box 8 (Pax-8), epithelial membrane antigen (EMA), and Ki67 labeling index (Ki67 LI). Magnetic resonance imaging (MRI) revealed uneven signals in the right peripheral zone of the prostate. Both prostate biopsy and post-prostatectomy pathology examination revealed prostate acinar adenocarcinoma with positive staining of P504S and Ki67 LI. The patient has been in periodic follow-up and has remained in good general condition without any evidence of recurrence to date. To the best of our knowledge, the present report is the only case of systematically described pre- and post-therapy laboratory, pathology, and imaging examination results. Our report together with published studies suggest that increased awareness of synchronous PRAD risk will enable early detection and prompt therapies in patients with RCC.