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Disseminated Tuberculosis and Saccular Aneurysm Findings on FDG PET/CT in a Patient With Polyarteritis Nodosa.

A 42-year-old man with mediastinal lymphadenopathy and lung nodules on thoracic CT underwent noncontrast F-FDG PET/CT for further evaluation. Maximum intensity projection (Fig. 1A, red arrows) revealed multiple focal FDG uptake in the supraclavicular, infraclavicular, thoracic, and abdominopelvic regions. Miliary nodules and infiltration zones in both lungs and lymph nodes with increased FDG uptake in multiple regions in the mediastinal (Fig. 1B, yellow arrow) and abdominopelvic (Fig. 1C, yellow arrows) regions were observed on axial images of PET/CT. Central regions of many of these lymph nodes were hypometabolic due to necrosis. Also, a lesion was found that could not be differentiated from necrotic lymph node or aneurysm in the abdominal para-aortic region (Fig. 2A–B, white arrows). The findings on PET/CTwere considered to indicate a malignant process. The patient was further questioned to tailor treatment plan, and he reported that he had polyarteritis nodosa (PAN) for 2 years, and he was under an immunosuppressive