After what period may a ring of enhancement around a hemorrhage become evident on a contrast CT or MR image? Characteristics of hemorrhage evolve with the age of the lesion. What signal intensity do acute, subacute, and chronic hemorrhages have on T1- and T2-weighted images? How can blood reach brain tissue distal to an occlusion? How does an acute infarct appear on DWI? How does an acute infarct appear on T1-weighted MRI? How does an acute infarct appear on T2-weighted MRI? How long after an infarct is cystic cavitation of brain tissue seen? How long does it take for an intracerebral hematoma to lose enough density to match the CSF? How long may this ring enhancement last? How many days after an infarct does the edema increase to a maximum? How soon can an infarct be detected on DWI? If the infarct is accompanied by hemorrhage, how does the blood appear on noncontrast CT? List five other causes of spontaneous intraparenchymal hemorrhage in adults. List four common causes of cerebral venous thrombosis. List four major causes of morbidity and mortality in aneurysm patients. List four sites where spontaneous intraparenchymal hemorrhages usually occur. List nine other types of lesions associated with ring enhancement. List three appropriate imaging tests for identifying an AVM. List three reasons this is done. List three signs of significant stenosis on Doppler ultrasound. Name another noninvasive imaging study that can accurately characterize carotid stenosis. What are diagnostic tests for venous thrombosis? What are five other rare causes of SAH? What are the common changes seen on CT with acute infarct? What are the five most common locations of a saccular aneurysm? What are the treatment options? What are the two most common causes of Subarachnoid hemorrhage (SAH)? What are the two most common clinical presentations of AVM? What can be seen in a region of subacute ischemic infarct after the administration of intravenous contrast? What change is often seen in the brain parenchyma near an AVM? What density is acute blood on CT? What does an AVM look like on an angiogram? What does an AVM look like on noncontrast CT? What imaging test is the gold standard for identifying cerebral aneurysms? What is a stroke? What is seen on MRI of an AVM? What is subclavian steal syndrome? What is the best imaging test when SAH is suspected? What is the gold standard diagnostic procedure for carotid artery stenosis? What is the imaging test of choice for a patient suspected of having had a stroke? What is the most common cause of infarction? What is the most common cause of intraparenchymal hemorrhage in adults? What is the most common location for atherosclerosis in the carotid system? What is the most common underlying cause of spontaneous intraparenchymal hemorrhage in adults? What is the most sensitive sequence for detecting an infarct on MRI? What is the standard noninvasive screening test for detection of atherosclerosis at this location? What is the typical appearance of diffuse hypoxic or anoxic injury? What is the usual cause of arterial spasm? What is this cavitation called? What noninvasive imaging test can accurately characterize most aneurysms? What other condition can also mimic this appearance? What pathophysiologic process accounts for these changes? Which condition is associated with a string-of-beads appearance of the cervical internal carotid artery on CTA or on angiography? Book traversal links for Cerebrovascular ‹ Why do many tumors enhance? Up After what period may a ring of enhancement around a hemorrhage become evident on a contrast CT or MR image? ›