Fig. 3
Findings of imaging studies after carbon-ion radiotherapy. a Contrast-enhanced computed tomography revealed no tumor growth (arrowheads). However, duodenal dilatation was observed (arrow). b CECT revealed a duodenal obstruction accompanied by wall thickening at the third portion of the duodenum (arrowheads). The oral duodenum was dilated (arrow). c Endoscopy revealed a duodenal compressive obstruction. The endoscope could not pass through this duodenal obstruction. d 18-fluoro-2-deoxy-glucose positron emission tomography/computed tomography after carbon-ion radiotherapy revealed slight FDG accumulation (standardized uptake value ranging from 3.14 to 3.20) in the pancreatic lesion without findings of distant or lymph nodal metastasis