Unusual vascular complications of dissecting thoracic aortic aneurysms.

Nondissecting, chronic, thoracic aortic aneurysms (TAA) may be associated with such vascular complications as aorto-cardiac, aorto-superior vena caval (SVC) and aorto-pulmonary arterial (PA) fistual formation, and/or SVC or PA compression. Dissecting TAA have been associated with these lesions far less often. This report summarizes the occurence and outcome of the following complications of dissecting TTA: (1) SVC obstruction; (2) aorto-right and -left atrial, aorta-right ventricular and aorto-PA fistula formation; (3) compression of the PA and (4) hematoma of the interatrial septum. Two patients are described with aortic dessection complicated by: (1) SVC obstruction and aorto-left atrial fistula; and (2) aorto-PA fistula. These complications are rarer with aortic dissection, because of the acute, catastrophic nature of this lesion. When dissection is chronic, however, arteriovenous fistulae are often well tolerated, and urgent surgical intervention seems to be unnecessary.