PI -RADS category range from 1-5. Category 1 and 2 minimal..

or low risk of cancer. Cat 3 equivocal (inconclusive).  Cat 4-5 high risk of cancer. 如果 prostate density 高過1.5 and Pi-RADS 5，基本可以肯定cancer. 要看的是whether the cancer is progressive and 有沒有擴散。