knuckle sign

knuckle sign

in chest radiography, an abrupt tapering of a large pulmonary artery caused by pulmonary embolism.
Farlex Partner Medical Dictionary © Farlex 2012
An uncommon radiologic sign of pulmonary embolism without infarction, which is characterised by a dilated pulmonary artery with abrupt tapering of the occluded vessel distally
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.