Acute subdural bleeding is blood collection in subdural space. usually caused by laceration of the bridging vein that runs from cortex to meningeal layer. On the other hand. the acute epidural hematoma is a collection of blood above the dura mater. https://www.lightemupsequences.com/hot-mega-Esko-Nexus-HeightMaster-Vented-Safety-Helmet-big-savings/