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a displays the PET scan of a subject with multicentric Castleman disease (MCD) in the coronal view. Enlarged axillary and cervical lymph nodes and an enlarged spleen are seen in a, demonstrating the systemic nature of MCD. b–d display the CT, PET, and PET/CT cross-sectional scans of the subject’s thorax, respectively. d displays high uptake of lymph nodes in the right and left axillary regions as shown in a
