CONGENITAL AGENESIS APLASIA OF THE INTERNAL CAROTID ARTERIES - MRA AND SPECT FINDINGS

Single photon emission CT (SPECT) and MRI and MR angiography studies w ere performed in a patient with right internal carotid artery (ICA) ag enesis, left ICA aplasia, and multiple associated vascular abnormaliti es identified with digital subtraction angiography. Magnetic resonance angiography provided an excellent depiction of the extra- and intracr anial vascular abnormalities. No evidence of brain lesions or perfusio n defects was demonstrated with MRI and SPECT, despite the markedly al tered vascular anatomy.