title: Fluorodeoxyglucose Positron Emission Tomography-Computed Tomography (FDG PET/CT) Findings in an Unusual Case of Multiple Myeloma Presenting with a Large Extra-Axial Intracranial Mass.
abstract: BACKGROUND
  We aimed to present unusual cranial FDG PET/CT findings of a 56-year-old female with multiple myeloma (MM).
  
  
  METHODS
  Plain CT images revealed a lytic lesion in the right parietal bone, filled with an oval-shaped, large, extra-axial, extradural, intracranial mass which measured 75×75×40 mm and had smooth borders. The right parietal lobe was compressed by the mass. The maximum standardized uptake value (SUVmax) of the mass lesion was 8.94 on FDG PET/CT images. Multiple lytic lesions with an increased uptake were also detected in other calvarial bones, in several vertebras and in the proximal left femur. After seven months, a control FDG PET/CT following radiotherapy and chemotherapy revealed almost complete regression of the right parietal extra-axial mass lesion. The number, size and metabolism of lytic lesions in other bones also decreased.
  
  
  CONCLUSIONS
  FDG PET/CT was useful for an initial evaluation of MM lesions and was effective in monitoring the response of these lesions to therapy.
authors.affiliation: Department of Nuclear Medicine, Mersin State Hospital, Mersin, Turkey.
authors.forename: Sevin
authors.initials: S
authors.lastname: Ayaz
authors.affiliation: Department of Radiology, Mersin Women's and Children's Hospital, Mersin, Turkey.
authors.forename: Ümit Yaşar
authors.initials: ÜY
authors.lastname: Ayaz
keywords: Fluorodeoxyglucose F18; Multiple Myeloma; Positron-Emission Tomography; Skull Neoplasms