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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.

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[14] Pseudoaneurysm in the Antibiotics, resection aortic isthmus, of the pseudoaneurysm, mediastinal abscess, resection of the bilateral pleural esophagus effusion Chen et al.
There is narrowing in the region of the aortic isthmus (arrows, Figures 2 and 4).
Percutaneous recanalization and balloon angioplasty of congenital isolated local atresia of the aortic isthmus in adults.