Active Bone Marrow With Focal FDG Accumulation Mimicking Bone Metastasis With a Case of Early Esophageal Cancer

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A 68-year-old man underwent 18F-FDG PET/CT for the staging of esophageal carcinoma discovered by a medical checkup. Increased focal accumulation in some vertebrae, right humerus, and right femoral bone was noted on FDG-PET, whereas CT showed relatively high attenuation, and MRI showed hypointense lesions on T1- and T2-weighted imaging. A bone biopsy revealed mildly hypercellular bone marrow in the thoracic spine with FDG accumulation and markedly hypocellular bone marrow in the pelvic bone without an increased uptake. 111InCl scintigraphy showed a similar distribution and confirmed the diagnosis of bone marrow reconversion.

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