Arc of Riolan

Case contributed by Dr Donna D'Souza
DSA (angiography)

This patient had severe proximal SMA stenosis.  

An enlarged Arc of Riolan (red arrow) can be seen connecting the proximal IMA (not opacified in this image) with the proximal SMA (poorly opacified due to the stenosis). During the angiographic run, the AOR filled retrogradely from the IMA to the SMA to provide collateral flow, illustrating the hemodynamic significance of the SMA stenosis.

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Case information

rID: 36156
Published: 15th May 2015
Last edited: 13th May 2019
Inclusion in quiz mode: Excluded

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