Hematoma epidural (HED) located outside the dura but the cavity in the skull shape and characteristics resemble biconvex or convex lens. About 70 - 80% found in the HED Temporal or temporoparietal region caused by tear artery meningea media due cracked skull bones (Price, 2006).
Blood that occurs usually comes from the arterial duct, but in the third case can occur due to bleeding vein, Because it is not rare HED caused tear sinus venosus region, especially in the parieto-occipitalis posterior fossa or on. Figures incident injury and is less related to the cause of a more lightweight. Usually, HED venosus occurs with depression fraktur skull bones, where the dura from the bone tear and it resulted in made room for blood to akumulasion. In some patients, especially in cases with clinical manifestations of delayed, HED venosus can therapy action with non-operating (Price, 2006).
HED generally be regarded stable, the maximum size to be happening within minutes of injury, however, Borovich explained that progresivitas of HED on 9% of patients took place in the first 24 hours. Re-bleeding that persists can lead to the occurrence estimated progresivitas. One case of HED can become chronic and known a few days after injury (Ullman, 2006).
In some cases of HED are reported without beginning with trauma. Etiology disease include infections in the skull bone, blood vessel malformasi the dura mater, the skull bones to metastase. HED can also develop spontaneously in the patient-related problems coagulate with primary treatment (eg, liver disease end of the stadium, alcoholic chronicles, other diseases related to disfungsi platelet) (Ullman, 2006).
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