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August 1984

Computed Tomography With Gas Cisternography for Detection of Small Acoustic Tumors: A Study of Five False-Positive Results

Author Affiliations

From the Otologic Medical Group, Inc, Los Angeles (Drs Barrs, Luxford, and Brackmann); the Department of Otolaryngology, Wilford Hall, US Air Force Medical Center, San Antonio, Tex (Dr Barrs); and the Department of Radiology, University of Southern California School of Medicine, Los Angeles (Dr Becker).

Arch Otolaryngol. 1984;110(8):535-537. doi:10.1001/archotol.1984.00800340047013

• 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.

(Arch Otolaryngol 1984;110:535-537)

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