Abstract：
OBJECTIVE: To describe the circumflex left aortic arch as a new form of canine congenital vascular ring anomaly leading to esophageal constriction.
METHODS: 3 large-breed dogs of variable age: a 9-month-old entire male German Shepherd Dog-Rottweiler cross, a 17-week-old entire male German Shepherd Dog, and a 9-year-old neutered female Labrador Retriever, seen between April 2022 and May 2023.
METHODS: Dogs presented for chronic postprandial regurgitation and poor growth. One dog presented for a hard mass on the caudal mandibular region.
RESULTS: Computed tomography revealed a normal leftward-oriented cranial half and an abnormal caudal half of the aortic arch crossing toward the right dorsal hemithorax leading to esophageal constriction in all dogs. In addition, 1 dog presented with a right patent ductus arteriosus and 1 with an aberrant right subclavian artery.
CONCLUSIONS: Circumflex left aortic arch is a newly discovered rare type of congenital vascular ring anomaly in dogs, which presents a similar anatomical derangement to the human form. Clinical signs include postprandial regurgitation and poor growth. Circumflex left aortic arch vascular anomaly cannot be surgically corrected via the left thoracotomy that is commonly used for the more common vascular ring anomalies in dogs. Computed tomography is a useful diagnostic modality for the diagnosis of this condition, detection of concomitant congenital vascular malformations, evaluation of associated pathologies, and surgical planning.
METHODS: 3 large-breed dogs of variable age: a 9-month-old entire male German Shepherd Dog-Rottweiler cross, a 17-week-old entire male German Shepherd Dog, and a 9-year-old neutered female Labrador Retriever, seen between April 2022 and May 2023.
METHODS: Dogs presented for chronic postprandial regurgitation and poor growth. One dog presented for a hard mass on the caudal mandibular region.
RESULTS: Computed tomography revealed a normal leftward-oriented cranial half and an abnormal caudal half of the aortic arch crossing toward the right dorsal hemithorax leading to esophageal constriction in all dogs. In addition, 1 dog presented with a right patent ductus arteriosus and 1 with an aberrant right subclavian artery.
CONCLUSIONS: Circumflex left aortic arch is a newly discovered rare type of congenital vascular ring anomaly in dogs, which presents a similar anatomical derangement to the human form. Clinical signs include postprandial regurgitation and poor growth. Circumflex left aortic arch vascular anomaly cannot be surgically corrected via the left thoracotomy that is commonly used for the more common vascular ring anomalies in dogs. Computed tomography is a useful diagnostic modality for the diagnosis of this condition, detection of concomitant congenital vascular malformations, evaluation of associated pathologies, and surgical planning.
摘要：
目的：描述回旋左主动脉弓是犬先天性血管环异常导致食管缩窄的一种新形式。
方法：3只不同年龄的大型犬：9个月大的全雄性德国牧羊犬-罗威纳犬，一只17周大的全雄性德国牧羊犬,和一只9岁绝育的雌性拉布拉多猎犬,2022年4月至2023年5月之间。
方法：出现慢性餐后反流和生长不良的狗。一只狗在尾下颌区域表现出坚硬的肿块。
结果：计算机断层扫描显示正常的左半侧颅骨和异常的尾半侧主动脉弓向右背半侧胸，导致所有狗的食管收缩。此外,1只狗右侧动脉导管未闭，1只右锁骨下动脉异常。
结论：左旋主动脉弓是一种新发现的罕见的犬先天性血管环异常，呈现出与人类形态相似的解剖学紊乱。临床症状包括餐后反流和生长不良。左旋主动脉弓血管异常无法通过左胸切开术进行手术纠正，左胸切开术通常用于狗中更常见的血管环异常。计算机断层扫描是诊断这种情况的一种有用的诊断方式，检测伴随的先天性血管畸形，相关病理的评估，和手术计划。
方法：3只不同年龄的大型犬：9个月大的全雄性德国牧羊犬-罗威纳犬，一只17周大的全雄性德国牧羊犬,和一只9岁绝育的雌性拉布拉多猎犬,2022年4月至2023年5月之间。
方法：出现慢性餐后反流和生长不良的狗。一只狗在尾下颌区域表现出坚硬的肿块。
结果：计算机断层扫描显示正常的左半侧颅骨和异常的尾半侧主动脉弓向右背半侧胸，导致所有狗的食管收缩。此外,1只狗右侧动脉导管未闭，1只右锁骨下动脉异常。
结论：左旋主动脉弓是一种新发现的罕见的犬先天性血管环异常，呈现出与人类形态相似的解剖学紊乱。临床症状包括餐后反流和生长不良。左旋主动脉弓血管异常无法通过左胸切开术进行手术纠正，左胸切开术通常用于狗中更常见的血管环异常。计算机断层扫描是诊断这种情况的一种有用的诊断方式，检测伴随的先天性血管畸形，相关病理的评估，和手术计划。
