Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
mask phenomenonPost-emetic purpura that follows prolonged vomiting–'retching', appearing as evanescent punctate macules on the face/upper neck, thought to be due to abruptly ↑ intrathoracic pressure; similar lesions occur in violent coughing, Valsalva maneuver, or strangulation, and accompanied by conjunctival petechiae
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.