Large Vestibular Aqueduct Syndrome (LVAS) is an uncommon disorder described as sudden and progressive sensorineural hearing loss. The vestibular aqueduct is a narrow, bony canal that connects the inner ear and the cranial cavity. It is related to the bony labyrinth of the inner ear. LVAS is also known as Enlarged Vestibular Aqueduct syndrome (EVAS) and Vestibular Aqueduct syndrome (VAS). LVAS received its name in 1978 simply because the large vestibular aqueduct was the only part of the disorder visible on a CT scan.

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