I had a ct scan 3 wks ago and it showed 2 areas of thickening in the small bowel. The thickenings are on the outside walls. Today I had a PET scan, no tumors showed up, but, one of the thickenings, the longer one, has grown. The radiologists do not know what this is. HOW CAN I FIND OUT. IS SURGERY THE ONLY ANSWER? Thank you.