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Figure 21b. Thymic uptake in a 17-year-old boy with Hodgkin disease. (a) Axial PET scan obtained 4 months after completion of chemotherapy shows increased FDG uptake in the anterior mediastinum (arrow). (b, c) CT scans obtained just after completion of chemotherapy (b) and 4 months later (c) show interval enlargement of the thymus with normal architecture (arrow).
