[Primary Pericardial Dedifferentiated Liposarcoma Detected by Fluorodeoxyglucose Positron Emission Tomography/Computed Tomography;Report of a Case].

We herein present a rare case of dedifferentiated liposarcoma originating from the pericardium. A 79-year-old female was referred to our hospital with a pericardial tumor detected by fluorodeoxyglucose positron emission tomography/computed tomography (FDG-PET/CT). The tumor, 80×48 mm in size, showed increased uptake of fluorodeoxyglucose on the FDG-PET/CT without any evidence of metastasis. The tumor was resected with the pericardium, and a histopathological examination confirmed the diagnosis of dedifferentiated liposarcoma. Additional chemotherapy, radiation therapy, or a combination of both were offered but refused by the patient. Although the patient was discharged without any complications, the tumor recurred locally 2 months after the surgery, and the patient succumbed 15 months later. The FDG-PET/CT was useful not only in detecting this malignant tumor but also in diagnosing its malignant nature.