Coronal images of computed tomography or positron emission tomography scans showing a regression of peritoneal metastases. (a) Contrast-enhanced abdominal computed tomography scan showing multifocal metastatic peritoneal nodules (white arrows) in September 2013. The patient completed intraperitoneal radiotherapy followed immediately by tumor boost radiotherapy. (b) Surveillance by positron emission tomography scan, obtained 8 weeks after completion of radiotherapy, showed a complete metabolic response of metastatic peritoneal lesions. (c) A contrast-enhanced computed tomography scan, obtained in March 2014 after completion of radiotherapy, shows that most of the metastatic peritoneal lesions had disappeared.