My youngest brother has been diagnosed with a serious brain tumor which doctors told us he will not recover from.He He has been having problems with his bladder for some weeks now an at moment has no control of his bladder.Is this a sign of the start of a shut down of an organ.We were told his brain will shut down an his organs would start to fail. he has  A GRADE 4 CANCEROUS MELANOMA TUMOR ON BASE OF HIS BRAIN WHICH CONTROLS HIS SIGHT AN SPEECH.IT IS 7 cm in size at last measurement .
Hi! Thank you for your question! I'm really sorry about your brother. You have to remember that the brain is a very compact organ enclosed by hard bone - so there is actually very little space for anything when a tumor grows. A tumor of 7 cm will cause displacement of brain tissue, nerves, and fluid which can exert pressure on neighboring or even distant structures. The loss of bladder control may be directly due to the tumor which may be directly or indirectly impinging on neural pathways to your brothers' bladder. I hope I was able to answer your question. Please do not hesitate to contact me if you have anymore. Take care! Chat Doctor. 