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Related Experiment Videos

False-positive CT gas cisternogram.

H J Robertson, H P Hatten, J W Keating

    AJNR. American Journal of Neuroradiology
    |May 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Computed tomographic (CT) gas cisternography may show nonfilling of the internal auditory canal due to a meniscus effect. Brisk head shaking can improve gas filling, aiding acoustic neuroma diagnosis.

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    Area of Science:

    • Radiology
    • Neurology
    • Otolaryngology

    Background:

    • Computed tomographic (CT) gas cisternography is utilized for visualizing the internal auditory canal (IAC).
    • Accurate diagnosis of acoustic neuroma relies on detailed imaging of the IAC.

    Observation:

    • A retrospective review of 62 gas cisternograms revealed nonfilling of the normal IAC in 11% of cases.
    • The meatal surface of nonfilled canals appeared convex and pointed, mimicking a small acoustic neuroma.
    • A meniscus effect at the gas-cerebrospinal fluid interface was identified as the likely cause of nonfilling.

    Findings:

    • Nonfilling of the IAC on CT gas cisternography can be mistaken for acoustic neuroma.
    • Bone erosion within the IAC or meatus is a significant indicator of acoustic neuroma.

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  • Persistent nonfilling, in the absence of other signs, warrants further investigation.

    • Implications:

    • Techniques like brisk head shaking post-injection can enhance IAC gas filling.
    • Persistent nonfilling necessitates repeat cisternography with alternative contrast agents for definitive diagnosis.
    • Distinguishing true pathology from imaging artifacts is crucial for appropriate patient management.