CT, FDG-PET, and FDG-PET/CT fusion of a 13-year-old female with Hodgkin disease. (A-C) Axial CT images show (A) a cervical lymph node mass (), (B) a large mediastinal mass (*) compressing the left brachiocephalic vein (), an enlarged axillary lymph node (), and (C) an enlarged inhomogeneous spleen (419). (D-F) Axial PET images show pathologic FDG uptake in (D) cervical lymph nodes (), (E) in the mediastinum (*), in a left axillary lymph node mass (), and (F) in the spleen (). (G-I) Fused PET/CT images. (I) Note the misregistration of normal renal FDG excretion ().