Congenital Isolated Right Subclavian Artery in Two Calves

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  • 子牛2例に認められた右鎖骨下動脈分離
  • コウシ 2レイ ニ ミトメラレタ ミギ サコツ カ ドウミャク ブンリ

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Abstract

Isolation of the right subclavian artery was observed in a 2-day-old female Japanese black calf and in a 12-day-old male Holstein calf. In both calves, the brachiocephalic trunk originating from the left aortic arch branched from the left subclavian artery and terminated in a bifurcation into the left and right common carotid arteries. The left ductus arteriosus arose in a normal manner from the aortic arch and joined the pulmonary trunk. The isolated right subclavian artery was connected to the right pulmonary artery by the right ductus arteriosus and passed to the right forelimb. In addition to an isolated right subclavian artery, the Japanese black calf had ventricular and atrial septal defects and an aberrant origin of the paraconal interventricular branch of the left coronary artery from the pulmonary trunk. The Holstein calf, on the other hand, demonstrated complete transposition of the great arteries with an intact ventricular septum.

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