Left carotid dissection with crescent sign and left sided Horner syndrome.

Images from: 

Nautiyal Amit, Sonal Singh, Michael DiSalle and John O'Sullivan. “Painful Horner Syndrome as a Harbinger of Silent Carotid Dissection.” PLoS Medicine 2, no. 1 (January 2005): e19.

Copyright : © 2005 Nautiyal et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

Original article: http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=545208

Modifications: cropped, MR annotations removed, resized.