title: False positive 18F-FDG PET in an ischial chondroblastoma; an analysis of glucose transporter 1 and hexokinase II expression.
abstract: We report a rare case of chondroblastoma arising from the ischium which showed an increased (18)F-FDG uptake. Chondroblastoma is an uncommon lesion and usually involves the epiphysis of long bones. However, in this case, the tumor appeared as a well-defined osteolytic lesion in the ischium on radiographs. MR imaging demonstrated two components in the tumor: a solid one and a multilobular cystic component. (18)F-FDG PET imaging revealed an increased uptake in the ischium. The (18)F-FDG uptake resembled the results observed in malignant bone tumors. A histological diagnosis of chondroblastoma was obtained from tissue of an open biopsy. An immunohistochemical analysis demonstrated weak expression of both Glut-1 and HK-II. These findings suggest that Glut-1 and HK-II expression are not strongly related to FDG uptake in chondroblastoma.
authors.affiliation: Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan. hamada@tracer.med.osaka-u.ac.jp
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Hamada
authors.forename: Takafumi
authors.initials: T
authors.lastname: Ueda
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Tomita
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: Akira
authors.initials: A
authors.lastname: Myoui
authors.forename: Katsuyuki
authors.initials: K
authors.lastname: Aozasa
authors.forename: Hideki
authors.initials: H
authors.lastname: Yoshikawa
authors.forename: Jun
authors.initials: J
authors.lastname: Hatazawa
mesh_terms: D000328:Adult; D014408:Biomarkers, Tumor / Q000378:metabolism; D001859:Bone Neoplasms / Q000000981:diagnostic imaging* / Q000378:metabolism*; D005189:False Positive Reactions; D019788:Fluorodeoxyglucose F18; D051272:Glucose Transporter Type 1 / Q000378:metabolism*; D006593:Hexokinase / Q000378:metabolism*; D006801:Humans; D007512:Ischium / Q000000981:diagnostic imaging* / Q000378:metabolism*; D008297:Male; D049268:Positron-Emission Tomography / Q000379:methods; D019275:Radiopharmaceuticals; D014018:Tissue Distribution
chemical_list: D014408:Biomarkers, Tumor; D051272:Glucose Transporter Type 1; D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18; D006593:Hexokinase