History: 70 year old male with acute right sided hemiplegia. Many different entities can cause increased signal on diffusion weighted imaging. The differential diagnosis includes acute ischemic stroke, abscess, empyema, epidermoid cyst, lymphoma, intracerebral hematoma, encephalomyelitis, diffuse axonal injury, meningioma, and multiple sclerosis. An excellent article reviewing these entities is found here. The patient from … Continue reading
History: 65 year old male with acute onset slurred speech and right hemiparesis. The susceptibility vessel sign is produced by the presence of deoxyhemoglobin within clot obstructing the left middle cerebral artery in this patient. Some articles have suggested this indicates cardioembolic stroke as an etiology.
History: 70 year old male with acute onset right hemiparesis and slurred speech. On this CT angiogram of the neck, the left internal carotid artery appears completely occluded, however, technically complete arterial occlusion can only be diagnosed on conventional catheter angiogram by ruling out a possible “string sign.” This patient went on to have a … Continue reading
History: 65 year old male presents with sudden onset right hemiparesis and slurred speech. This patient was found to have near complete left internal carotid artery occlusion on a subsequent CT-angiogram of the head and neck. This is a middle cerebral artery stroke.