Figure 3.

Patient no. 13 underwent resection of rectal GIST eight years prior (the thin arrow in A shows the anastomotic nail) and the tumor was reduced by 61% after six months of IM treatment at a dosage of 400 mg per day (indicated by thick arrows in AB). CT scans showed a huge mass located in the pelvic cavity, presenting as mixed cystic lesions (C). The tumor size decreased after 4 months of IM treatment (D) and the patient received surgical treatment at 4.5 months after initiation of IM treatment.