An Unusual Cause of Aortic Regurgitation in a Patient With Bicuspid Aortic Valve.

Aortic fibrous strands are considered residual tissue from aortic valve development. Rupture of these strands is an important albeit uncommon cause of aortic regurgitation (AR). The authors describe a 67-year-old man who was admitted to the authors' hospital with sudden onset shortness of breath and diagnosed with severe AR. The patient was scheduled for Bentall surgery. The transesophageal echocardiogram (TEE) found multiple fibrous strands that were present in multiple locations of the aortic valve, some of which were ruptured. Ruptured fibrous strands are in the differential diagnosis in patients presenting with acute AR without a more conventional explanation, and TEE is instrumental in securing the diagnosis.