Diffuse infiltration of the urethra is one of the symptoms of urethral tumors, which include male urethral cancer and female urethral cancer. Male urethral cancer varies according to the primary site, mostly metastatic epithelial carcinoma and squamous cell carcinoma. The causes are related to urethritis, urethral stricture and repeated urethral dilatation, but when the tumor invades the penis and perineum, it can metastasize to the inguinal lymph nodes. However, when the tumor invades the penis and perineum, it can metastasize to the inguinal lymph nodes. Prevention of diffuse infiltration of urethra caused by urethral tumor: 1. Drinking more water will discharge more urine with high concentration, drinking more water can not only dilute blood but also effectively dilute the concentration of urine. 2, do not hold urine, once the bladder is full with the intention to urinate should urinate, hold urine is not good for the bladder and prostate, before taking a long bus should first empty urine and then take the car, on the way if urine is urgent then should greet the driver to get off to urinate never hard to hold. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things.