Abstract
Purpose
To describe a case of a nonbifurcating cervical carotid artery with remnant of the proximal internal carotid artery (ICA).
Methods
A 47-year-old man with unruptured cerebral aneurysm underwent magnetic resonance (MR) angiography of the neck region and intracranial region. The MR machine was a 3-T scanner. Catheter angiography was performed for the treatment of the aneurysm by coil embolization.
Results
The proximal main trunk of the left external carotid artery (ECA) was absent, and branches arose separately, indicative of a nonbifurcating cervical carotid artery. At the level of the ICA origin, aneurysmal protrusion was found on MR angiography. On catheter angiography, this protrusion was not an aneurysm but a remnant of the proximal ICA.
Conclusion
The configuration of the nonbifurcating cervical carotid artery lacks the proximal ECA; however, segmental agenesis of the proximal ICA forms this rare cervical arterial variation. The present case had remnants of the proximal ICA. We speculate that the ICA channel, except for the origin, was occluded after the development of EC-ICA anastomosis, and a nonbifurcating cervical carotid artery with a remnant of the ICA may have formed. Including our patient, only four cases have been reported in the relevant English-language literature.
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AU carried out the study design and drafted the manuscript. AU and SI reviewed the manuscript critically, and have read and approved the final manuscript.
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Uchino, A., Ishihara, S. A nonbifurcating cervical carotid artery with a remnant of the proximal internal carotid artery that mimicked an aneurysm on magnetic resonance angiography. Surg Radiol Anat 45, 1305–1309 (2023). https://doi.org/10.1007/s00276-023-03231-7
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DOI: https://doi.org/10.1007/s00276-023-03231-7