Shorthand: SDH, Full Form: SubDural Hematoma For more information of "SubDural Hematoma", see the section below. A subdural hematoma (SDH) is a type of bleeding in which a collection of blood —usually but not always associated with a traumatic brain injury —gathers between the inner layer of the dura mater and the arachnoid mater of the meninges surrounding the brain. Answer:An acute subdural hematoma (SDH) is a clot of blood that develops between the surface of the brain and the dura mater, the brain's tough outer covering, usually due to stretching and tearing of veins on the brain's surface. The full Form of SDH is Synchronous Digital Hierarchy. Check about the working of SDH, Advantages & disadvantages of SDH and SDH Full form in Medical and Hindi!