Research Article

Sacral Insufficiency Fracture after Radiotherapy for Cervical Cancer: Appearance and Dynamic Changes on 18F-Fluorodeoxyglucose Positron Emission Tomography/Computed Tomography

Figure 4

A 56-year-old woman who underwent pelvic radiotherapy for cervical cancer developed hip pain at 9 months after radiotherapy. Focal FDG uptake (SUVmax, 2.6) in the left sacral ala (yellow arrow) was found in the axial PET image, while the low-dose CT showed high density and a very small right anterior sacral fracture line (white arrow). Follow-up FDG PET/CT at 6 months after diagnosis of SIF. The bone density increased, and the metabolic intensity decreased.