Thanks.  Good case.  Basically agree with above.  2 points: pic 3 and another show round glands with cribriform periphery tumor and central comedo necrosis.  That reminds me of gleason patter 5 of prostate cancer.  Of course urothelial carcinoma can have this morphology too.  Since the tumor is in the lower urethra, i think we should also think of prostate cancer extending up to lower urethra or concomittant prostate cancer.  Second point:  the cartilagious tissue does not appear malignant to me, may represent reactive metaplastic changes.  It is a very rare and peculiar tissue to see in urethra.  But we need to be careful to call this carcinosarcoma,

 好病例，收藏了！

 浸润性尿路上皮癌，肉瘤样变异型。