title: [Cystic changes of the posterior cranial fossa on the nuclear magnetic resonance tomogram].
abstract: MR images were obtained in 15 patients with cystic lesions in the posterior fossa and the results compared with computed tomography (CT). The abnormalities imaged included 5 epidermoids, 3 haemangioblastomas, 4 arachnoid cysts, 1 postoperative cyst, and 4 large cisterns. One advantage of MR is the ability to demonstrate lesions in three planes and without artifacts. Liquor-related intensity measurements of cyst contents provided important information, thereby improving diagnostic specificity and patient management. T2-weighted images were found to be more sensitive in characterising cystic lesions of the posterior fossa than were T1-weighted images. Large cisterns, arachnoid and postoperative cysts had an intensity pattern identical or almost identical to cerebral spinal fluid. More proteinaceous cysts, including epidermoids and to a higher degree haemangioblastomas, had clearly higher intensity than cerebral spinal fluid on the T2-weighted images.
mesh_terms: D000328:Adult; D001099:Arachnoid; D001927:Brain Diseases / Q000175:diagnosis*; D001932:Brain Neoplasms / Q000175:diagnosis; D002946:Cisterna Magna; D003388:Cranial Fossa, Posterior; D003560:Cysts / Q000175:diagnosis*; D003937:Diagnosis, Differential; D004814:Epidermal Cyst / Q000175:diagnosis; D005260:Female; D006394:Hemangiosarcoma / Q000175:diagnosis; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012886:Skull / Q000000981:diagnostic imaging / Q000473:pathology*; D014057:Tomography, X-Ray Computed
vernacular_title: Zystische Veränderungen der hinteren Schädelgrube im Kernspintomogramm.