vacuum sign

A sign evoked by traction to a joint which causes coalescence of gas within a joint; the sign disappears in effusions
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

vacuum sign

Imaging A normal radiologic finding; traction applied to a joint causes coalescence of gas within a joint; the VC disappears in effusions
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
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