Artikel
Bilateral duplication of superior cerebellar artery with double helix "DNA-like" morphology
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Veröffentlicht: | 9. Juni 2017 |
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Objective: Although SCA is the most constant vessel feeding the cerebellum, several anatomical variations are described. Origin from P1, duplications, triplications are well known alternative patterns. We report a case of bilateral duplication of the superior cerebellar artery associated with double helix morphology of the proximal S1 segment.
Methods: A 45 years old male patient underwent digital subtraction angiography to investigate the suspect of an incidental basilar tip aneurysm.
Results: A complete right vertebral dominance, usual ipsilateral pica and aica morphology as well as a left sided convexity characterized the proximal two third of the basilar artery. The left vertebral artery served terminated directly with the ipsilateral pica. Between the distal two third of the artery was noted an almost 90° change of direction of the vessel in dorsal direction. In this portion the angiogram confirmed the presence of a broad neck aneurysm with rostral projection. Distally on the posterolateral portion of the trunk originated bilaterally duplicated SCAs. Those showed “DNA-like” double helix morphology bilaterally. The basilar artery terminated with two usual P1.
Conclusion: Unusual DNA-like morphology of the SCA to our knowledge has never been described in the literature. This can´t be explained with secondary modifications of the vessel´s morphology due to hypertonia-related elongation and coiling. Variations in the formation of the dorsal carotid division represent the results of the pattern described.