title: Primary giant cell tumor of soft tissue: fluid-fluid levels at MRI (2010:3b).
abstract: OBJECTIVE
  Giant cell tumor of soft tissue (GCT-ST) is an extremely rare lesion with an unpredictable behavior. The histological appearance closely resembles that of giant cell tumor of bone and, as such, has been characterized as the soft-tissue equivalent.
  
  
  METHODS
  We describe the clinical, histological and radiological features of an unusual magnetic resonance imaging (MRI) and deep intramuscular location of GCT-ST with fluid-fluid levels (FFLs) simulating other soft tissue tumors or a hydatid cyst in a 52-year-old man. The lesion was resected.
  
  
  RESULTS
  Neither metastasis nor recurrence has occurred in the 6-month period since resection. A review of the literature did not reveal any similar description of intramuscular GCT-ST.
  
  
  CONCLUSIONS
  GCT-ST should be included in the differential diagnosis of soft tissue tumors with FFLs.
authors.affiliation: Servicio de Radiodiagnóstico, Hospital de Cabueñes, Asturias, Spain. ameana@telefonica.net
authors.forename: Ana Rosa
authors.initials: AR
authors.lastname: Meana Moris
authors.forename: Pedro
authors.initials: P
authors.lastname: García Gonzalez
authors.forename: Eduardo
authors.initials: E
authors.lastname: Fuente Martin
authors.forename: Carmen
authors.initials: C
authors.lastname: Gonzalez Suarez
authors.forename: Luis
authors.initials: L
authors.lastname: Moro Barrero
mesh_terms: D001826:Body Fluids / Q000166:cytology*; D018286:Carcinoma, Giant Cell / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D019042:Muscle Neoplasms / Q000473:pathology*; D013848:Thigh / Q000473:pathology