Fig. 10

Patient with stage 4 melanoma in CMR on single-agent nivolumab with symptoms of intermittent nausea, vomiting and diarrhoea and clinical diagnosis of immune-related enteritis underwent ¹⁸F-FDG PET which showed moderate to intense diffuse uptake in the stomach, duodenum and small bowel in keeping with immune-related gastritis, duodenitis and enteritis (MIP image A). Short interval ¹⁸F-FDG PET after successful treatment of irAEs (MIP image B), showed two foci of intense FDG uptake in the small bowel (red arrows) in keeping with metastases and a third focus in the left abdomen near the transverse colon, in keeping with serosal metastasis (blue arrow)