title: Filling defects and nonfilling of the internal auditory canal in posterior fossa myelography.
abstract: A review of posterior fossa myelography at St. Joseph Hospital within the past 5 years is presented. Three false positive diagnoses have been found. Two of the cases were proved to have arachnoiditis, while one demonstrated a knuckle of artery in the canal. One case with large acoustic neuromas causing nonfilling of the contralateral canal is presented. One case with Type I intracanalicular tumor out of 40 acoustic neuromas in the series was diagnosed prior to surgery. The indication for posterior fossa myelography are discussed with a review of the literature.
mesh_terms: D001100:Arachnoiditis / Q000000981:diagnostic imaging; D001932:Brain Neoplasms / Q000000981:diagnostic imaging*; D002530:Cerebellopontine Angle; D003388:Cranial Fossa, Posterior / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D008579:Meningioma / Q000000981:diagnostic imaging*; D009192:Myelography / Q000379:methods; D009442:Neurilemmoma / Q000000981:diagnostic imaging*; D010524:Peripheral Nervous System Neoplasms / Q000000981:diagnostic imaging*; D010579:Petrous Bone / Q000000981:diagnostic imaging*; D012886:Skull / Q000000981:diagnostic imaging*; D013679:Technology, Radiologic; D014056:Tomography, X-Ray; D000159:Vestibulocochlear Nerve