The reason for this may lie in the extensive anastomoses that exist between the terminal branches of the external carotid arteries
, both ipsilateral and contralateral.
The PPTA in our patient was not only combined with moyamoya disease and fenestration of the basilar artery but also with consolidated symmetrical variations of branches of both external carotid arteries
, which has never been reported.
It is able to detect plaque at the bifurcation of the internal and external carotid arteries
, and is used to define vascular anatomy proximal and distal to a stenotic plaque.
Notably, this mass did not appear to be hypervascular, and it did not displace the internal and external carotid arteries
, which would have suggested a carotid-body tumor.
1) The carotid body is the most common site for these tumours to arise, and these carotid body tumours characteristically splay the internal and external carotid arteries
Neurologically he remained completely asymptomatic as regards to the carotid dissections, and repeat CT angiography showed stable dissections with widely patent internal and external carotid arteries
Usually the carotid bifurcation is enlarged; internal and external carotid arteries
are surrounded by the mass.
After the bulb, the CCA terminates as it divides into 2 branches, the internal and external carotid arteries
The adventitial coat of the internal carotid artery was significantly thicker than those of the common carotid and external carotid arteries
, with no significant difference noted between the latter arteries.
The common carotid, proximal internal and external carotid arteries
are extracranial vessels.