Battle sign

Retroauricular or mastoid ecchymosis (ie, Battle sign) typically appears one to three days after a basilar skull fracture is sustained.

Basilar Skull Fracture. In: Color Atlas of Emergency Trauma, Mandavia, DP, Newton, EJ, Demetriades, D, Cambridge University Press, Cambridge, UK 2003. Reprinted with the permission of Cambridge University Press. Copyright © 2003.

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