"It was first described by Marc S Lapayowkeh (1927-2014), an American radiologist, and his colleagues 1. In their seminal paper, the "vestibular line" was expressed to indicate a gross estimate of the medial extent of the middle ear on anteroposterior digital subtraction angiography and CT 1. Of the one hundred examined, no normal patient possessed a carotid artery which was lateral to this line 1."