Abstract
Fibrous dysplasia is a common benign disorder of bone in which normal bone marrow is replaced with fi tissue. As PET /CT is increasingly used for the staging of different malignant disease, incidentally found fi brous dysplasia with increased FDG uptak e may mimic metastasis. We report on a 46-year-old woman with fi dysplasia who underwent PET/CT because of suspected recurrence of bre ast cancer and was misdiagnosed as a bony metastasis with a focal FDG uptake on left proximal femur. This lesion was interpreted as fi brous dysplasia based on MRI in addition to the plain radiographs. We conclude that MRI in addition to radiography may help to differentiate fidysplasia mimicking metastasis on PET/CT in the patients with malignancy.
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