hi, my teenage brother has an enlarged spleen, he's had it for a long time now, the doctor keeps doing ultrasounds and has confirmed that is is getting bigger. however he can not figure out what is causing it. he has done some blood tests to rule out leukemia. the doctor now says that because he doesn't know what the cause is, he wants just keep waiting and watching out for symptoms, while being careful not to do anything that could make it burst. also i'm not sure if this could be related at all, but he also had his gallbladder removed due to gallstones, and it was because of his gallbladder problems that his enlarged spleen was discovered.