title: Osteoid osteoma--the CT vessel sign.
abstract: OBJECTIVE
  To evaluate whether the presence of a feeding vessel in proximity to osteoid osteomas of long bones on multidetector CT (MDCT) can be an adjuvant clue for the diagnosis of osteoid osteoma.
  
  
  METHODS
  Forty-nine CT scans of patients with radiological and clinical diagnosis of osteoid osteoma of long bones and a control group of 20 CT scans of patients with cortical-based lesions other then osteoid osteoma were analyzed. Two radiologists evaluated the CT images in consensus for the presence of a blood vessel in the same axial slices in which the nidus of osteoid osteoma was seen and to determine the incidence.
  
  
  RESULTS
  In 39 cases (79.6%) of osteoid osteoma, a blood vessel either entered the nidus (23 patients) or was seen in proximity to it (16 patients). This was significantly different (P < 0.05) from the cortical-based lesions, in which only two CT scans (10%) showed a blood vessel in the lesion's proximity.
  
  
  CONCLUSIONS
  In the majority of osteoid osteoma lesions in long bones, a blood vessel can be seen on MDCT either entering the nidus itself or in its proximity. The role of this vessel in the lesion pathogenesis and whether it improves diagnostic accuracy need further evaluation.
authors.affiliation: Dept of Diagnostic Imaging, The Sheba Medical Center, Tel Hashomer, Israel. mdgalyaniv13@gmail.com
authors.forename: Gal
authors.initials: G
authors.lastname: Yaniv
authors.forename: Noga
authors.initials: N
authors.lastname: Shabshin
authors.forename: Michal
authors.initials: M
authors.lastname: Sharon
authors.forename: Boaz
authors.initials: B
authors.lastname: Liberman
authors.forename: Alex
authors.initials: A
authors.lastname: Garniack
authors.forename: Uri
authors.initials: U
authors.lastname: Rimon
authors.forename: Iris
authors.initials: I
authors.lastname: Eshed
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D005360:Fibula / Q000473:pathology; D006801:Humans; D006811:Humerus / Q000473:pathology; D008297:Male; D008875:Middle Aged; D010017:Osteoma, Osteoid / Q000098:blood supply* / Q000175:diagnosis* / Q000473:pathology; D013977:Tibia / Q000473:pathology; D014057:Tomography, X-Ray Computed