Aberrant internal carotid artery
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Aberrant internal carotid artery is a variant of the internal carotid artery and represents a collateral pathway resulting from involution of the normal cervical portion (first embryonic segment) of the internal carotid artery 5.
The two vessels that enlarge to form the aberrant internal carotid artery are:
The vessels rejoin the horizontal segment of the petrous portion of the internal carotid artery.
The anomaly may be associated with a persistent stapedial artery 7.
Patients may present with pulsatile tinnitus, particularly if there is stenosis in the vessel. On otoscopic examination, it appears as a retrotympanic vascular mass. If mistaken for a paraganglioma and biopsied, the results can be disastrous.
Findings of aberrant internal carotid artery on CT include:
enlarged inferior tympanic canaliculus within the caroticojugular spine with small vessel traversing it
absent carotid plate, as vessel connects to the normal horizontal portion of the petrous internal carotid artery
absent or hypoplastic vertical segment of the carotid canal
Characteristic findings of aberrant internal carotid artery on angiography include:
enlarged tympanic branch of ascending pharyngeal artery
more lateral and posterior route of petrous part of internal carotid artery than usual
lateral extension of the internal carotid artery well (pinched contour of the vessel) beyond the vestibular line of Lapayowker
lateralized internal carotid artery: protrudes into the anterior mesotympanum but does not course across the cochlear promontory from the posterior mesotympanum nor enlarge the inferior tympanic canaliculus 7
aneurysm of the petrous segment of the internal carotid artery