Bilateral dissecting aneurysms of the extracranial vertebral arteries associated with cervical carotid artery aneurysm.

Dissecting aneurysms of the vertebrobasilar system are infrequent. Most of the commonly reported cases describe iatrogenic or traumatic aneurysms of the extracranial vertebral artery. Spontaneous dissecting aneurysms of the extracranial vertebral artery are frequently associated with carotid artery lesions; however, such association is poorly documented in the literature. We describe a case of vertebrobasilar stroke due to dissection of the vertebral arteries associated with a saccular and unruptured mid-cervical internal carotid artery aneurysm.