Example PET-CT images. (A) Focal FDG uptake in T2 on fused PET-CT sagittal image representing a DLBCL deposit (red arrow); no uptake at a compression fracture of T11 (green arrow) with confirmatory magnetic resonance image; iliac crest biopsy was negative. (B) Case with 10% diffuse DLBCL involvement on marrow histology, without increased FDG uptake in bone marrow. (C) Diffuse uptake throughout skeletal marrow, which was confirmed as DLBCL on marrow histology. The patient was HIV-positive with MYC and BCL2 abnormalities. PET and fused PET-CT coronal slices are shown.