If a CT scan is performed for prostate cancer, it usually can detect the tumor in the prostate, especially an enhanced CT scan will show enhancement. However, to confirm the diagnosis, it is still necessary to perform a prostate biopsy to find cancer cells. Only with the detection of cancer cells can prostate cancer be diagnosed. Additionally, a blood test for the tumor marker PSA, which generally increases, can be used in combination with these findings for a comprehensive evaluation. The definitive diagnosis of prostate cancer requires a biopsy to find cancer cells, which is the gold standard for diagnosing prostate cancer.