title: Imaging of an unusually located aggressive osteoblastoma of the pelvis: a case report.
abstract: BACKGROUND
  We present a case of an aggressive osteoblastoma involving the posterior acetabular column and the ischium, which is very rare location for the tumor.
  
  
  METHODS
  A 21-year-old man presented with a persistent pain on the left buttock which extended on the rear surface of the thigh and the front surface of the left hip. A plain radiograph, a CT and MRI examinations were performed. The tumor was radically excised and histologically it proved to be an aggressive osteoblastoma.
  
  
  CONCLUSIONS
  Although aggressive osteoblastoma is a rare entity it should be considered in the differential diagnosis of bone tumors. Our purpose is to reveal the radiographic presentation of this rare tumor.
authors: M
authors: M
authors: Pilavaki
authors: G
authors: G
authors: Petsatodis
authors: E
authors: E
authors: Petsatodis
authors: A
authors: A
authors: Cheva
authors: P
authors: P
authors: Palladas
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