MRI AND MR-ANGIOGRAPHY OF PERSISTENT TRIG EMINAL ARTERY AND ITS VARIANT

We describe the magnetic resonance imaging and magnetic resonance angi ography findings in 5 cases of persistent trigeminal artery, and in tw o cases of variant trigeminal artery. Six patients underwent complete four-vessel angiography, performed to depict other pathology. Magnetic resonance imaging and magnetic resonance angiography allowed in each case to visualize this artery and to precise its latero or intrasellar situation. The variant is not defined on conventional magnetic resona nce imaging, but may be individualized on magnetic resonance angiograp hy. In each case, identification of these persistent artery is crucial if surgery of sellar or gasserian region is planned.