Abstract
Fluorine-18 Fluordeoxyglucose Positron Emission Tomography (FDG-PET) is a useful tool in monitoring of sarcoma treatment. Recent data demonstrated an increase of tumour uptake with time compared to a decline in inflammatory lesions in dual time PET scanning. We demonstrate a patient with pulmonary masses 6 months after surgical removement of a mediastinal soft tissue sarcoma. Using PET scans 1h and 3h p.i 320 MBq FDG (,i.e. a combined PET/CT using CT-based attenuation correction and a conventional PET with measured attenuation correction), an increased tracer-uptake was observed in a single pulmonary mass, thus leading to the diagnosis of malignancy. Subsequent CT guided biopsy and further clinical follow-up, however, demonstrated the absence of malignancy and showed inflammatory disease instead.
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