To study the variations in the course of the paraclival and parasellar carotid arteries in normal subjects using magnetic resonance angiography as is relevant from an endoscopic endonasal perspective.
Two hundred MR angiographies of normal subjects were analyzed in a prospective study. The intercarotid distances were measured at fixed points along the paraclival and parasellar segments of the internal carotid artery. The intercarotid spaces thus obtained were categorized into trapezoid, square and hourglass shapes. The angle between the posterior ascending vertical and horizontal bend of the parasellar ICA was also measured and analyzed.
The trapezoid shape of intercarotid space is the most common (52.5%), followed by the square (35%) and the hourglass (12.5%) shaped spaces. Angle of < 80° between the posterior ascending vertical and horizontal bend of the parasellar ICA was found in 39% of subjects, angle between 80° and 100° was found in 9% subjects, angle > 100° was found in 43% while asymmetric angles on the two sides was found in 9% of subjects.
A thorough understanding of the course of the ICA is important in planning the approach and preventing injury to the ICA.
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The authors have no relevant financial or non-financial interests to disclose.
Approval was obtained from the ethics committee of Nanavati Superspeciality Hospital. The procedures used in this study adhere to the tenets of the Declaration of Helsinki.
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Jayashankar, N., Patangrao, H. Magnetic resonance angiographic study of variations in course of paraclival and parasellar internal carotid artery in relation to expanded endonasal endoscopic approaches. Eur Arch Otorhinolaryngol (2021). https://doi.org/10.1007/s00405-021-07123-7
- Internal carotid artery
- Paraclival ICA
- Parasellar ICA