title: Pathologic significance of the "dural tail sign".
abstract: OBJECTIVE
  The exact nature of the "dural tail sign" (thickening of the dura adjacent to the tumour in contrast enhanced T1-MRI imaging) is still not clearly established. In this study we tried to verify the histological appearance of the "dural tail sign" and probable correlation between different MRI findings and dural tail histology.
  
  
  METHODS
  In this study, 129 patients with intracranial lesions underwent MRI imaging with 1.5T scanner. The "dural tail sign" was defined using Goldsher et al. criteria. Size and pattern of enhancement of the tumour and adjacent dura was noted in MRI and in the pathologic samples, dural tail and the dura beneath the tumour was assessed.
  
  
  RESULTS
  In 30 cases, "dural tail sign" was evident on MRI, dural tail noted in 17 of these cases in histological samples (12 meningiomas, 3 pituitary adenomas and 2 schwannomas). All of them had vessel dilatation, 6 showed tumoural invasion, 4 demonstrated intravascular growth of the lesion and 1 showed inflammation of the dura.
  
  
  CONCLUSIONS
  In our study MRI findings failed to predict tumoural invasion of the dural tail in histologic samples and because of frequent presence of tumour nests in it, the dura matter should be resected as widely as possible.
authors.affiliation: Department of Radiology and Imaging, Imam Khomeini Hospital, Keshavarz Boulevard, Medical Sciences/Tehran University, Tehran, Iran. rokniyaz@sina.tums.ac.ir
authors.forename: Hadi
authors.initials: H
authors.lastname: Rokni-Yazdi
authors.forename: Farid
authors.initials: F
authors.lastname: Azmoudeh Ardalan
authors.forename: Zahra
authors.initials: Z
authors.lastname: Asadzandi
authors.forename: Houman
authors.initials: H
authors.lastname: Sotoudeh
authors.forename: Madjid
authors.initials: M
authors.lastname: Shakiba
authors.forename: Ali
authors.initials: A
authors.lastname: Adibi
authors.forename: Hossein
authors.initials: H
authors.lastname: Ayatollahi
authors.forename: Maryam
authors.initials: M
authors.lastname: Rahmani
mesh_terms: D000328:Adult; D001921:Brain / Q000473:pathology*; D004388:Dura Mater / Q000473:pathology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity