Antler sign (lung)
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The antler sign is an uncommon sign of lung torsion on CT where branches from the main pulmonary artery all arise from a single side, indicating twisting of the lobe or lung.
In the normal lung, the main pulmonary arteries are straight and lobar and segmental branches arise from it on both sides.
This is not to be confused with the stag's antler sign referring to upper lobe pulmonary venous diversion (cephalisation) in pulmonary venous hypertension or pulmonary edema as seen on frontal chest radiograph.