Abstract
In a dog showing a bilaterally symmetrical hyperplastic goitre, Dog 16, the following vascular changes were made: 1. Ligation of the internal jugular vein below the mouth of the inferior thyroid vein and above the superior thyroid vein (passive hyperemia). 2. Section of the internal jugular vein below the origin of inferior thyroid vein and anastomosis of the distal end to the central end of the left common carotid artery. Results. — Clinically, on the left side (anemic), no marked change was observed. On the right side (hyperemic), a great temporary swelling followed by a marked decrease in size of the right lobe occurred. Seven months later the left lobe measured 8 by 4.5 by 3 centimeters, and the right lobe measured 5 by 2.5 by 2 centimeters.
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