title: Hibernoma Showing High Uniform Accumulation on an18F-Fluorodeoxyglucose Positron Emission Tomography Scan: A Case Report.
abstract: BACKGROUND
  Hibernoma is a rare, benign, soft tissue tumor arising from brown fat that cannot be distinguished from other lipogenic tumors on computed tomography and magnetic resonance imaging (MRI) scans. On the other hand, the image of hibernoma on18F-fluorodeoxyglucose positron emission tomography (18F-FDG-PET) is different from that of other lipogenic tumors. However, fewer studies have investigated the typical features of hibernoma on PET scans. We present the case of a hibernoma that was incidentally detected on18F-FDG-PET.
  
  
  METHODS
  A 48-year-old Asian man underwent18F-FDG-PET for routine follow-up of gastric cancer. The patient reported a painless soft mass on the upper arm that had persisted for several years. On18F-FDG-PET, the mass showed a maximum standardized uptake value of 9.6. The mass showed high intensity on T1- and T2-weighted MRI scans, and showed focally enhanced septa after gadolinium administration. The mass was surgically resected. Histopathologically, the mass was composed of brown adipose cells characteristic of hibernoma. His postoperative course was uneventful, and there was no local recurrence at the final 24-month follow-up.
  
  
  CONCLUSIONS
  Hibernoma showed strong uniform accumulation on18F-FDG-PET, suggesting that18F-FDG-PET would be a useful modality for the differential diagnosis of hibernoma versus other lipogenic tumors.
authors.affiliation: Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Kamata
authors.affiliation: Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo, Japan.
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Kikuta
authors.affiliation: Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo, Japan.
authors.forename: Michiro
authors.initials: M
authors.lastname: Susa
authors.affiliation: Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo, Japan.
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Nishimoto
authors.affiliation: Department of Pathology, Keio University School of Medicine, Tokyo, Japan.
authors.forename: Aya
authors.initials: A
authors.lastname: Sasaki
authors.affiliation: Department of Pathology, Keio University School of Medicine, Tokyo, Japan.
authors.forename: Kaori
authors.initials: K
authors.lastname: Kameyama
authors.affiliation: Department of Radiology, Keio University School of Medicine, Tokyo, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Murakami
authors.affiliation: Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo, Japan.
authors.forename: Masaya
authors.initials: M
authors.lastname: Nakamura
authors.affiliation: Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo, Japan.
authors.forename: Morio
authors.initials: M
authors.lastname: Matsumoto
authors.affiliation: Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo, Japan.
authors.forename: Hideo
authors.initials: H
authors.lastname: Morioka
keywords: 18F-FDG-PET; Brown fat; Hibernoma