hatband sign

A unilateral sweat stain on a hatband, seen in Horner syndrome, which is associated with lung cancer
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

hatband sign

A unilateral sweat stain on a hat, seen in Horner syndrome, classically associated with lung CA.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.