Front Neurol. The area of the convergent-type hemorrhage is not identical to that of the DAI and is larger than it. When the medullary vein is involved, it may show a fan-shaped distribution, as in this case. (a–c) LYG in a 68-year-old woman. At SWI(d) and contrast-enhanced MR imaging (e), there are dilatations of the deep-draining medullary vein in the occipitotemporal white matter. Clinical outcome was classified as good if the modified Rankin Scale score was <3. Note the four convergence points. eCollection 2020. (b)DWI shows high-signal-intensity cortical signals only in the temporooccipital region. Axial T2*-weighted images (h, i) show dilatation of the medullary vein. Multiple Sclerosis.—Multiple sclerosis (MS) is an autoimmunity-mediated, inflammatory, demyelinating disease affecting the central nervous system (CNS). Deep medullary vein thrombosis may be isolated or associated with other lesions. Axial SWI(g) shows a convergent-type hemorrhage (arrows) in the left and right frontal lobes. The area of the convergent-type hemorrhage is not identical to that of the DAI and is larger than it. Imaging findings of IVL vary widely, including normal findings, nonspecific white matter lesions, multifocal mass lesions, progressive infarctlike lesions, and dural and arachnoidal enhancement. 11, 12, 13 In one study difference between the area of prominent MV appearance on SWI and area of restricted diffusion on DWI was successfully used as a predictor of response to revascularization therapy. 5 Four of our 5 patients (80%) retrospectively demonstrated atypical perimedullary vessels … Clinical outcome was classified as good if the modified Rankin Scale score was <3. (2)Department of Radiology, Center for Neuroimaging, The … There are defects or hypotrophy of the cortical veins or superficial draining veins in the area with dilated deep medullary veins. There are defects or hypotrophy of the cortical veins or superficial draining veins in the area with dilated deep medullary veins. Okudera et al (7) and Huang et al (9) speculated that the formation of convergence zones correlates with the rapid changes in the course, shape, size, and number of the converging medullary veins caused by the fast-growing crossing nerve fiber tracts, including projection, commissural, and association fiber tracts. Asymmetry of Deep Medullary Veins on Susceptibility Weighted MRI in Patients with Acute MCA Stroke Is Associated with Poor Outcome . Medullary veins and white matter fiber tracts. The characteristic distribution of MS lesions described previously is also important for discrimination from neuromyelitis optica. Figure 2b. 1 = first (or outer) zone of convergence, 2 = second (or candelabra) zone of convergence, 3 = third (or palmate) zone of convergence, 4 = fourth (or subependymal) zone of convergence, AMV = anastomotic medullary vein, Arc = arcuate vein, DMV = deep medullary vein, Ic = intracortical veins, ICV = internal cerebral vein, LCV = longitudinal caudate veins of Schlesinger (vessels running in the anterior-posterior direction are represented as multiple dots), PV = pial veins, SbF = subcallosal fasciculus, Sc = subcortical vein, SEV = subependymal vein, SGS = subependymal glial substance, SMV = superficial medullary vein, SOFF = superior occipitofrontal fasciculus, TCV = transcerebral vein. Because of the location of the arterial watershed zone, the fragile capillary network, and the direct connection to the deep venous system, the germinal matrix tends to suffer from arterial ischemic reperfusion injury and venous congestion (27). textoreach thesubependymal veins[1,2J. COVID-19 is an emerging, rapidly evolving situation. CC = corpus callosum. After reaching the cortex, the vein continues as a superficial cerebral vein, and eventually opens to the dural sinus. (Courtesy of Ryuta Itoh, MD, PhD, Shiga University of Medical Science Hospital.) ), Figure 11d. At SWI(a), a convergent-type hemorrhage (arrows) can be seen in the right occipital lobe. Arterial phase appears normal although late capillary blush may be present. Figure 3d. On an axial FLAIR image (e), a typical MS plaque shows distribution perpendicular to the ventricle, but one lesion (arrow) shows distribution along the ventricle. (d–f) A 4-day-old infant girl with congenital protein C deficiency and sinus thrombosis. Venous angiomas are the most common type of vascular malformation. When the medullary veins are involved, IVL is speculated to show a fan-shaped distribution, as in the case shown in Figure 9. Figure 9c. The deep venous system consists of the network of subependymal veins and drains toward the internal cerebral veins, basal vein of Rosenthal, and great vein of Galen. ); and Department of Radiology, Nara Medical University, Kashihara, Japan (A.F., T.M., K.K. 1 = first (or outer) zone of convergence, 2 = second (or candelabra) zone of convergence, 3 = third (or palmate) zone of convergence, 4 = fourth (or subependymal) zone of convergence, AMV = anastomotic medullary vein, Arc = arcuate vein, DMV = deep medullary vein, Ic = intracortical veins, ICV = internal cerebral vein, LCV = longitudinal caudate veins of Schlesinger (vessels running in the anterior-posterior direction are represented as multiple dots), PV = pial veins, SbF = subcallosal fasciculus, Sc = subcortical vein, SEV = subependymal vein, SGS = subependymal glial substance, SMV = superficial medullary vein, SOFF = superior occipitofrontal fasciculus, TCV = transcerebral vein. At contrast-enhanced MR imaging (c), prominent ringlike enhancement can be seen. Subcortical U-fibers are also spared. AHLE in a 49-year-old woman. (a) At plain CT, small calcifications (arrow) can be seen in the occipital cortex. Since the prominent hypointense vessels may be cortical veins, medullary veins, subependymal veins, or even small arteries containing deoxyhemoglobin, we adopted the term PVS in … Br J Radiol. FOIA (a) Dissection of internal carotid artery (arrow) visualized at time-of-flight MR angiography. Figure 5g. AHLE in a 49-year-old woman. This finding may indicate that congestion of the medullary vein is part of the cause of these hemorrhages. CC = corpus callosum. On axial FLAIR image (a), a fan-shaped high-intensity signal can be seen in the white matter of the left parietal lobe. (d–f) A 4-day-old infant girl with congenital protein C deficiency and sinus thrombosis. (a–c) DVI in a 61-year old man, 8 days after injury in a traffic accident. In 1984, Huang et al (13) proposed the term medullary venous malformation (MVM) for this condition, instead of venous angioma, which has the connotation of a neoplasm. Differential diagnosis at MR imaging includes other diseases affecting the vascular wall or perivascular space, such as sarcoidosis, primary angiitis of the CNS, and other granulomatous angiitis disorders (44). (Reprinted, with permission, from reference 48.) (a–c) DVI in a 61-year old man, 8 days after injury in a traffic accident. In the acute phase, within the 1st month of life, the morphologic pattern of lesions suggests that the deep medullary veins are enlarged, congested, and/or thrombosed. Online ahead of print. Background and purpose: Change in cortical vessel signs on susceptibility-weighted images after full recanalization in hyperacute ischemic stroke. Figure 9a. (d–f) LYG in a 22-year-old woman after chemotherapy for osteosarcoma. Figure 2a. 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