Non-obstructing clot/thrombus in the basilar artery

Methemoglobin clot is visualized medially within a focal aneurysmal dilatation of the basilar artery on axial and coronal T1-weighted scans. Evaluation of axial T2-weighted and DWI scans reveals a small acute infarct, located within the brainstem just medial to the clot, and presumed to be secondary to occlusion of small paramedian penetrating branches from the basilar artery.

Non-obstructing clotthrombus in the basilar artery

Part of the on-line supplement to Neuroradiology – The Essentials with MR and CT (© 2015)