Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40792-016-0285-8/MediaObjects/40792_2016_285_Fig1_HTML.gif)
a Coronal CT images showed an enhanced tumor measuring 5.3 × 4.2 cm behind the rectum. b After the treatment of imatinib, coronal CT images revealed that the tumor size decreased to 3.5 cm. c Axial CT images showed an enhanced tumor at the right posterior side of the rectum. d After treatment of imatinib, axial CT images revealed that the tumor size decreased to 3.5 cm