Fig. 14

69-year-old man with prior localization of melanoma on the trunk. Baseline images (MIP view and transaxial slice at the level of the descending aorta) are shown at baseline (A) and interim PET (B). Recurrent nodal disease in the right axillae and the right hilum can be seen. Interim PET, performed at the time the patient who had been treated with ICIs for 5 months, shows the appearance of a diffuse vasculitis pattern involving not only the thoracic aorta but also brachial and femoral arteries (including small-caliber arteries, black dotted arrows) but lack of response in axillary nodal disease