Do not forget the contralateral side: late onset bilateral carotid dissecting aneurysms.

Internal carotid artery dissection may occur spontaneously or following a blunt or penetrating trauma to the head and/or neck. Bilateral dissections and pseudoaneurysm formations are extremely rare and usually detected simultaneously. In this report, we present a trauma case with bilateral dissecting pseudoaneurysms of the carotid arteries; in whom, the one side was initially occult and then developed during the follow-up of the contralateral side.