Radiopaedia.org is a free educational radiology resource with one of the web's largest collections of radiology cases and reference articles.

Case of the Day

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Carotid arterial dissection

Contributed by A.Prof Frank Gaillard

Carotid dissection is an important diagnostic consideration in the setting of stroke. On CT the presence of an expanded outer diameter, and on MRI the presence of a high T1 signal crescent sign are helpful in making the diagnosis. 

What is Radiopaedia.org ?

Radiopaedia is a rapidly growing open-edit educational radiology resource which has been primarily compiled by radiologists and radiology trainees from across the world. Our mission is to create the best radiology reference, and to make it available for free, forever... read more

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If you are new to Radiopaedia.org or interested in contributing or collaborating for the first time, we recommend familiarisation with a few initial steps.

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