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Carotid Duplex Scan Findings in Congenital Absence of Right Common Carotid Artery

Carotid duplex scanning is a standard screening procedure for assessing disease of the extracranial carotid artery. The vascular technologist plays a key role in the assessment of anatomical location as well as detection, quantification, and characterization of the pathological process. Congenital anomalies of the carotid artery that can be recognized by scanning of the neck are very rare occurrences. Hence, when present, it is difficult to appreciate and correctly diagnose. Jerius et al.1 described a case of congenital absence of the right common carotid artery that was not correctly appreciated on duplex scanning. The following case illustrates that adhering to a standard protocol for scanning the carotid artery and considering the possibility of congenital variations of normal anatomy when a normal anatomical pattern is not visualized can lead to the correct diagnosis.