A patient complains of nycturia, constant boring pain in perineum and suprapubic region, weak urine jet, frequent, obstructed and painful urination. He has been ill for several months, pain in perineum appeared after getting problems with urination. Rectal examination revealed that prostate is enlarged (mostly owing to the right lobe), dense, asymmetric, its central sulcus is flattened, the right lobe is dense, painless, tuberous. What disease can it be?