Abstract
A 3-year-old girl with embryonic rhabdomoysarcoma arising from the right maxilla and invading the base of the skull underwent proton radiation followed by poly-chemotherapy for 6 months. Three to 9 months after completion of therapy, a possible residual tumor was evident on magnetic resonance images (MRI) based on a contrast-enhancing lesion (8 × 11 mm) in the right pterygopalatine fossa. Biopsy was nondiagnostic. Before surgery, positron emission tomography (PET) with F-18 fluorodeoxyglucose (FDG) with a dual-head camera was performed. Lesion hypometabolism and thus nonviability were confirmed by MRI-PET fused images. MRI and PET performed 3 months later confirmed the initial findings of F-18 FDG PET. Dual-head PET systems can deliver correct answers to difficult questions related to disease management in oncology, especially when anatomic information is integrated.
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