Spectrum of Magnetic Resonance Imaging Findings in Vertebral Artery Dissection

Introduction: Vertebral artery dissection (VAD) is animportant cause of posterior circulation stroke in youngpatients and presents with a host of clinically varied symptomsdepending upon the type and site of dissection. Currentresearch aimed to study the spectrum of magnetic resonanceimaging findings in vertebral artery dissection.Material and methods: This was an observational studywhere a cohort of 193 patients of posterior circulation strokewere evaluated with magnetic resonance imaging and amongthem 17 patients having vertebral artery dissection wereselected and magnetic resonance imaging findings werestudied using spin echo, diffusion weighted imaging and 3Dtime of flight MR angiography sequences.Results: Of the total 17 patients imaged with age range of23-59 years (mean age 38 years), 11 were males and 6 werefemales. V3 was the commonest site of dissection (n=10)followed by V4 (n=4) and V2 (n=3). The most commonpattern of dissection was steno-occlusive (n=15), whereas2 patients had aneurysmal type of dissection. T1W imagesrevealed intra-arterial thrombus in all the 17 patients. T2Wrevealed absent flow in vertebral artery in 5 patients. 3D TOFMRA revealed narrowed lumen in 10 patients and completeocclusion in 5 patients. One patient revealed intimal flap on3D TOF MRA.Conclusion: MRI is an excellent non-invasive modality forevaluation of posterior circulation stroke. MRI in conjunctionwith MR angiography helps clinch the diagnosis of VAD andthus helps in planning management and subsequent follow upof these patients.