Isthmus

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ISTHMUS. A tongue or strip of land between two seas. Glos. on Law, 37, book 2, tit. 3, of the Dig.

References in periodicals archive ?
According to these criteria, AAH is present if the AA diameter between the innominate artery and the left common carotid artery is <60% of the ascending aorta diameter, if the AA diameter between the left common carotid artery and the left subclavian artery is <50% of the ascending aorta diameter, or if the diameter of the aortic isthmus is <40% of the ascending aorta diameter.
There is narrowing in the region of the aortic isthmus (arrows, Figures 2 and 4).
We present two cases with a completely obstructed descending aorta just distal to the isthmus, referred to as a blind coarctation or aortic isthmus atresia, that were treated using the covered CP Stent (Cheatam Platinum; Numed Inc.