A case of a right aortic arch in a Japanese black calf with symptoms of persistent ruminal tympany and dysphagia
2009
Miki, W.(Hokkaido Federation of Agricultural Mutual Aid Association, Ebetsu (Japan)) | Takehana, K. | Kusaba, N. | Suzuki, T. | Asano, M. | Ishikawa, T.
In a Japanese black calf that experienced recurrent ruminal tympany beginning at 17 days after birth, esophageal stenosis based on a vascular ring was diagnosed through endoscopy, transesophageal ultrasonography, and barium esophagography. The subject was equipped with a hernia net to induce eructation and the clinical course was observed. The calf was euthanized at 70 days of age due to persistent dysphagia. Necropsy revealed notable bulging of the rumen. The ascending aorta originating from the left ventricle shifted to the right aortic arch on the right side of the trachea and esophagus. This right aortic arch caused the bicarotid trunk and right subclavian artery to branch before running to the left side behind the esophagus and the trachea and causing the left subclavian artery to branch. It then shifted toward the left descending aorta. At the origin of the left subclavian artery, a left ligamentum arteriosum linked the left aortic arch and pulmonary artery. The right aortic arch, left ligamentum arteriosum, and pulmonary artery, along with the base of the heart, formed a vascular ring that completely surrounded the esophagus and trachea and the esophagus was compressed and narrowed by this vascular ring.
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