title: Investigation of juxtasellar and cerebellopontine angle meningiomas and neurogenic tumours: two-phase helical CT.
abstract: We performed two-phase helical CT in 31 patients with juxtasellar region and cerebellopontine angle tumours to evaluate its usefulness in differentiating meningiomas from neurogenic tumours. After the intravenous injection of 90 ml contrast medium at 3 ml/s, axial helical images were obtained with delays of 30 and 120 s. After the delayed axial images, we acquired coronal images. Changes in attenuation were assessed visually and quantitatively (by comparing the attenuation in Hounsfield units). There were 17 meningiomas and 14 neurogenic tumours, all pathologically proven. Two-phase helical CT showed a decrease in attenuation in 15 (88%) meningiomas and an increase in 14 (100%) neurogenic tumours from early to delayed axial images. Coronal images showed a decrease in attenuation in all 17 meningiomas and an increase in 13 (93%) of the neurogenic tumours. The mean HU and their ratios were significantly different between meningiomas and neurogenic tumours.
authors.affiliation: Department of Radiology, Samsung Medical Centre, Sungkyunkwan University School of Medicine, Seoul, Korea.
authors.forename: J W
authors.initials: JW
authors.lastname: Ryoo
authors.forename: D G
authors.initials: DG
authors.lastname: Na
authors.forename: J Y
authors.initials: JY
authors.lastname: Woo
authors.forename: K
authors.initials: K
authors.lastname: Park
authors.forename: H D
authors.initials: HD
authors.lastname: Kim
authors.forename: D S
authors.initials: DS
authors.lastname: Choi
authors.forename: H S
authors.initials: HS
authors.lastname: Byun
mesh_terms: D000328:Adult; D000368:Aged; D002528:Cerebellar Neoplasms / Q000097:blood / Q000150:complications* / Q000175:diagnosis*; D002530:Cerebellopontine Angle / Q000000981:diagnostic imaging* / Q000473:pathology*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008577:Meningeal Neoplasms / Q000097:blood / Q000150:complications* / Q000175:diagnosis*; D008579:Meningioma / Q000097:blood / Q000150:complications* / Q000175:diagnosis*; D008875:Middle Aged; D018317:Nerve Sheath Neoplasms / Q000175:diagnosis*; D011856:Radiographic Image Enhancement; D014057:Tomography, X-Ray Computed