(a) Pretreatment PET-CT image
(b) Posttreatment PET-CT image
Figure 2: 58-year-old female with follicular grade 3 lymphoma (a) without focal evidence of marrow involvement by PET. She had right iliac biopsy. The posttreatment PET-CT (b) again shows diffuse increase in marrow uptake. The SUV increases (from 1.7 to 3.8) on the right iliac bone marrow (red region) with pathologic examination negative for marrow involvement. The change of the SUV over bone marrow is all due to normal hematopoietic response to chemotherapy.