title: Dynamic (18)F-fluorodeoxyglucose positron emission tomography/CT in hibernoma: Enhanced tracer uptake mimicking liposarcoma.
abstract: We report on two cases of patients with fat-equivalent masses in computed tomography (CT), referred to our department for dynamic positron emission tomography/CT (dPET/CT) with (18)F-fluorodeoxyglucose ((18)F-FDG) in order to investigate their dignity. Both qualitative and quantitative information, as derived from dPET/CTs, couldn't exclude a high-grade liposarcoma: Visual evaluation, revealed a large hypermetabolic focus of intense (18)F-FDG uptake in each patient (average SUVs 8.3 and 11.3). Regression-based parametric imaging demonstrated an enhanced distribution volume, which correlates to perfusion, and a high phosphorylation rate that correlates to cell viability. Kinetic analysis, based on a two-tissue compartment model demonstrated an enhanced FDG transport k1 and an enhanced phosphorylation rate k3. A non-compartmental approach based on fractal dimension revealed also enhanced values. However, final diagnosis was based on biopsy, which revealed hibernoma, a benign brown fat tumor. Brown adipose contains increased numbers of mitochondria and a high-rate of glucose metabolism. Therefore, they have increased FDG uptake. The evaluation of lipomatous lesions on CT, with high FDG uptake, should include the possibility of hibernoma as a differential diagnosis.
authors.affiliation: Christos Sachpekidis, Safwan Roumia, Antonia Dimitrakopoulou-Strauss, Medical Positron Emission Tomography Group-Biological Imaging, Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center, 69115 Heidelberg, Germany.
authors.forename: Christos
authors.initials: C
authors.lastname: Sachpekidis
authors.affiliation: Christos Sachpekidis, Safwan Roumia, Antonia Dimitrakopoulou-Strauss, Medical Positron Emission Tomography Group-Biological Imaging, Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center, 69115 Heidelberg, Germany.
authors.forename: Safwan
authors.initials: S
authors.lastname: Roumia
authors.affiliation: Christos Sachpekidis, Safwan Roumia, Antonia Dimitrakopoulou-Strauss, Medical Positron Emission Tomography Group-Biological Imaging, Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center, 69115 Heidelberg, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Schwarzbach
authors.affiliation: Christos Sachpekidis, Safwan Roumia, Antonia Dimitrakopoulou-Strauss, Medical Positron Emission Tomography Group-Biological Imaging, Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center, 69115 Heidelberg, Germany.
authors.forename: Antonia
authors.initials: A
authors.lastname: Dimitrakopoulou-Strauss
keywords: 18F-fluorodeoxyglucose; Dynamic positron emission tomography/CT; Hibernoma; Kinetic Modeling; Parametric imaging