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. 2017 Dec 26;85(2):136–143. doi: 10.1016/j.bjorl.2017.11.008

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© 2017 Associação Brasileira de Otorrinolaringologia e Cirurgia Cérvico-Facial. Published by Elsevier Editora Ltda.

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Coronal CT sections showing the vidian canal (thick arrow), palatovaginal canal (thin arrow), foramen rotundum (arrowhead), pterygoid recess pneumatization (star). (A) Bilateral vidian canals inside the sphenoid corpus (VC Type 1), the right vidian canal located lateral to medial pterygoid plate and left located at same line. (B) The vidian canals which partially protruding into the sphenoid sinus (VC Type 2) bilaterally located at same line with the medial pterygoid plate. (C) The vidian canals which totally inside the sphenoid sinus with a stalk (VC Type 3).