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  • Title: CT detection of retroperitoneal gas associated with gas in intervertebral disks.
    Author: Beers GJ, Carter AP, Leiter B, Shapiro JH.
    Journal: J Comput Assist Tomogr; 1984 Apr; 8(2):232-6. PubMed ID: 6707271.
    Abstract:
    Three cases are presented with computed tomographic evidence of gas in retroperitoneal soft tissues in association with the so-called "vacuum phenomenon" (Knutsson sign) in lumbar disks. We review the explanations of Knutsson sign and offer an explanation of how extradiscal gas can occur in association with it.
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