title: FDG-PET imaging for chronic expanding hematoma in pelvis with massive bone destruction.
abstract: Chronic expanding hematoma is a rare presentation of a hematoma characterized by a persistent increase in size for more than a month after the initial hemorrhage. We present a 65-year-old man with a chronic expanding hematoma in his ilium who was receiving anticoagulant treatment. The patient had a delayed manifestation of a femoral neuropathy with massive bone destruction. 2-Deoxy-[18F]fluoro-D: -glucose (FDG) positron emission tomography (PET) imaging revealed an increased uptake in the rim of the mass in images acquired 1 h after FDG injection. FDG-PET scans were performed using a dedicated PET scanner (HeadtomeV/SET2400 W, Shimadzu, Kyoto, Japan), and the PET data for the most metabolically active region of interest (ROI) were analyzed. The maximum standardized uptake value (SUVmax) was set to a cut-off point of 3.0 to distinguish between benign and malignant lesions. The SUVmax of the patient's lesion was 3.10, suggesting a malignant lesion. The characteristics of FDG-PET images of chronic expanding hematomas, including the uptake of FDG in the peripheral rim of the mass as a result of inflammation, should be recognized as a potential interpretive pitfall in mimicking a sarcoma.
authors.affiliation: Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan. hamada@tracer.med.osaka-u.ac.jp
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Hamada
authors.forename: Akira
authors.initials: A
authors.lastname: Myoui
authors.forename: Takafumi
authors.initials: T
authors.lastname: Ueda
authors.forename: Ichiro
authors.initials: I
authors.lastname: Higuchi
authors.forename: Atsuo
authors.initials: A
authors.lastname: Inoue
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Tamai
authors.forename: Hideki
authors.initials: H
authors.lastname: Yoshikawa
authors.forename: Jun
authors.initials: J
authors.lastname: Hatazawa
mesh_terms: D000368:Aged; D000925:Anticoagulants / Q000008:administration & dosage; D001847:Bone Diseases / Q000000981:diagnostic imaging* / Q000601:surgery; D002908:Chronic Disease; D019788:Fluorodeoxyglucose F18; D006406:Hematoma / Q000000981:diagnostic imaging* / Q000601:surgery; D006801:Humans; D007085:Ilium; D008297:Male; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals; D014859:Warfarin / Q000008:administration & dosage
chemical_list: D000925:Anticoagulants; D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18; D014859:Warfarin