question: My 8 Year old son has a brain tumor since age 2. about 2 weeks ago he had surgery to correct blount s disease. Since then off and on he has blood spots mixed in his stool about the size of dimes and streaks on the tissue from wiping. Now he is experiencing accidents in bed by wetting and deficating in his pants without knowing he has done it. Today he is passing clear mucus from his anus once with a soft throat clearing he passed it in his pants and then needing to go to the restroom immediately after he used a bed side potty and it was all clear no color about a cup worth. What could cause this?