What is Subdural Haematoma?

The subdural veins run across the surface of the brain, inside the skull. A subdural haematoma is a mass of clotted or fluid blood which may build up if one of these veins is ruptured by head injury. If bleeding is severe, symptoms develop rapidly, resembling those of extradural haematoma. Bleeding can also be very slow and symptoms develop over several weeks; a condition known as chronic subdural haematoma.