Wednesday, 27 May 2015

xrayoftheweek 21 - can you spot the variant anatomy here?

This week's #xrayoftheweek is this oblique image from a CT - there is no abnormality, but there is a common anatomic variant - can you spot it?

Well done if you spotted the variant anatomy involving the arch of the aorta - this is known as a bovine arch. In this quite common variant (~15%), the brachiocephalic trunk shares an origin from the aorta with the left common carotid artery. Technically it's a misnomer because the most common anatomic arrangement in cattle is a single brachiocephalic trunk which trifurcates into left and right subclavian arteries and a bicarotid trunk.


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