Hello!
Thank you for the query.
You have not mentioned very important data like: where was the ulcer located (stomach,
small intestine, large intestine?). Where were the GIST located (DJ junction of what?)
If the ulcers are present in the stomach, small intestine and are hardly treatable, it is necessary to rule out Zollingers-Ellisons syndrome. This is caused by a tumor which keeps secreting gastrine hormone. Ulcers and diarrhea are characteristic for this syndrome.
GIST recurrence and metastases should be also considered. It can also give bleeding ulcers,
hemoglobin lost.
If the ulcers are in the large intestine inflammatory bowels diseases (like
Crohns disease or
Ulcerative Colitis) should be also considered.
It is advisable to have some tests.
Colonoscopy, gastroscopy, abdominal CT should be done at first. ANA and ANCA antibodies, gastrine level should be checked. For possible metastases, PET seems to be reasonable.
Hope you will find it helpful.
Regards.