Merck Manual

Please confirm that you are a health care professional

honeypot link

Vascular Ring Anomalies in Animals


Sandra P. Tou

, DVM, DACVIM, North Carolina State University

Last full review/revision Jan 2020 | Content last modified Oct 2020

Pairs of embryonic aortic arches exist during early fetal development and subsequently give rise to the carotid arteries (third arches), the aortic arch (left fourth arch), and the pulmonary arteries and ductus arteriosus (sixth arches). The other aortic arches regress, although the first aortic arches also become part of the maxillary arteries. Congenital defects may arise if development or dissolution of the aortic arches is disrupted. Multiple vascular ring anomalies have been reported in dogs, including persistent right aortic arch, double aortic arch, left aortic arch with right ligamentum arteriosum, and retroesophageal subclavian arteries.

Others also read
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Test your knowledge
Anemia may be regenerative, indicating the bone marrow is responding and attempting to replace red blood cells (RBCs), or nonregenerative, in which the bone marrow response is not able to meet the increased need for RBCs. Which of the following CBC findings is consistent with nonregenerative anemia? 
Become a Pro at using our website 

Also of Interest

Become a Pro at using our website