Figure 2

18F-FDG PET in a 21-year-old man with classical Hodgkin lymphoma. Coronal maximum intensity projection 18F-FDG PET shows a mediastinal tumor mass (A). Axial 18F-FDG PET with concomitant low-dose CT shows necrosisvisual with a photopenic area in the mediastinal tumor (B,C, arrows), with attenuation of around 18 HU on contrast-enhanced CT (D, arrow).