Hiroyuki Katano1, Kazuo Yamada. 1. Department of Neurosurgery, Nagoya City University Graduate School of Medical Sciences, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan. katano@med.nagoya-cu.ac.jp
Abstract
BACKGROUND: The twisted carotid bifurcation is a variant in which the ICA courses medially to the ECA. Because descriptions in the literature have been limited, we here document clinical features and surgical experience of CEA for cases of twisted carotid bifurcation. METHODS: Seventy-five out of a total of 106 consecutive cases with surgically treated carotid stenoses underwent CEA. The angle of twist was measured in the axial view of MDCT angiography as the medially deviated degree. RESULTS: Seven cases (9.3%) demonstrated twisted carotid bifurcations. Six were found on the right side and one was on the left. The average angle of twist was 80.0° ± 17.6°, whereas that with a normally positioned bifurcation was -7.4° ± 7.7°. Six patients (85.7%) had diabetes mellitus and 5 patients (71.4%) had hypertension as a coexisting disease. Carotid endarterectomy was successfully performed with correction of the carotid position except in 1 case. Postoperative MDCT angiography revealed twisted position as in the preoperative state in 4, complete correction to the normal position in 2, and half-correction in 1. CONCLUSIONS: Twisted carotid bifurcations were preferentially found in right severely atherosclerotic carotids in patients with diabetes mellitus and/or hypertension. Carotid endarterectomy of twisted carotids can be safely accomplished, sometimes with correction of the carotid position. Multidetector computed tomography angiography was useful for perioperative evaluation. Variation should be considered by the neurosurgeon and neurologists concerned in the evaluation and treatment of carotid stenoses.
BACKGROUND: The twisted carotid bifurcation is a variant in which the ICA courses medially to the ECA. Because descriptions in the literature have been limited, we here document clinical features and surgical experience of CEA for cases of twisted carotid bifurcation. METHODS: Seventy-five out of a total of 106 consecutive cases with surgically treated carotid stenoses underwent CEA. The angle of twist was measured in the axial view of MDCT angiography as the medially deviated degree. RESULTS: Seven cases (9.3%) demonstrated twisted carotid bifurcations. Six were found on the right side and one was on the left. The average angle of twist was 80.0° ± 17.6°, whereas that with a normally positioned bifurcation was -7.4° ± 7.7°. Six patients (85.7%) had diabetes mellitus and 5 patients (71.4%) had hypertension as a coexisting disease. Carotid endarterectomy was successfully performed with correction of the carotid position except in 1 case. Postoperative MDCT angiography revealed twisted position as in the preoperative state in 4, complete correction to the normal position in 2, and half-correction in 1. CONCLUSIONS: Twisted carotid bifurcations were preferentially found in right severely atherosclerotic carotids in patients with diabetes mellitus and/or hypertension. Carotid endarterectomy of twisted carotids can be safely accomplished, sometimes with correction of the carotid position. Multidetector computed tomography angiography was useful for perioperative evaluation. Variation should be considered by the neurosurgeon and neurologists concerned in the evaluation and treatment of carotid stenoses.