Where is the most frequent location for subependymal hemorrhage?

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Subependymal hemorrhage most often arises from the germinal matrix, a highly vascular, fragile area located just beneath the ependyma around the caudothalamic groove where the caudate nucleus and thalamus border the lateral ventricle. In preterm infants, this region is especially vulnerable due to immature autoregulation and sudden changes in cerebral blood flow. When the vessels rupture in this germinal matrix, blood tracks into the subependymal space along the caudothalamic groove, producing the characteristic subependymal hemorrhage. On neonatal ultrasound, this appears as echogenic material along the caudothalamic groove, which is why this site is the classic location. The frontal and temporal horns are parts of the ventricular system but are not the typical germinal matrix neovascular zone, so hemorrhage there is less characteristic.