title: Computed tomography with gas cisternography for detection of small acoustic tumors. A study of five false-positive results.
abstract: Cranial computed tomography (CT) with gas cisternography is reported to be the most accurate method of detection of small acoustic tumors. However, five false-positive CT results experienced in three years are now reported. This is a false-positive rate of 22% for tumors with less than 5-mm protrusion into the cerebellopontine angle, and a false-positive rate of 50% for tumors with less than 2-mm protrusion. A false-positive result is suspected if no mass protrudes at the porus or if gas enters the lateral internal auditory canal.
mesh_terms: D000328:Adult; D003390:Cranial Nerve Neoplasms / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011011:Pneumoencephalography; D011856:Radiographic Image Enhancement; D014057:Tomography, X-Ray Computed / Q000379:methods*; D000160:Vestibulocochlear Nerve Diseases / Q000000981:diagnostic imaging*