Role of MRI and Plain Radiograph to Diagnose Fibrous Dysplasia Mimicking Metastasis on PET/CT in a Patient with Breast Cancer

normal bone marrow is replaced with fibro-osseous tissue. Patients are often asymptomatic, and fibrous dysplasia is often detected incidentally in patients with malignancy in whom F-fluoro-2deoxy-glucose positron emission tomography (F -FDG PET/ CT) is performed for metastatic disease. PET/CT findings of fibrous dysplasia have been reported on several papers. The level of FDG uptake in fibrous dysplasia can be either intense or be normal with normal metabolism without any increased FDG uptake. Fibrous dysplasia may show the glucose avidity of the lesion and may mimic metastasis on PET/CT. In this clinical situation, fibrous dysplasia should be considered in differential diagnosis based on other imaging findings using MRI as well as radiography.