HEMORRHAGE SDH OCCURRED CAUSED BY ACCELERATION DECELERATION MECHANISM IN THE HEAD AND BRIDGING VEINS RUPTURE ESPECIALLY NEAR BY SUPERIOR SINUS SAGITALIS SUBDURAL HEMORRHAGE SDH MOST COMMON IN THE BRAIN TRAUMATIC INJURY IN OLD AGES AND YOUNG PEOPLE EITHER IN OLD AGES MOSTLY A BRAIN ATROTHPY AND THESE IS A BASIC PATHOLOGY PROCESS WHY SUBDURAL HEMORRHAGE SDH SOMETIMES OCCURED WITHOUT SIGNIFICANT TRAUMATIC BRAIN INJURY HISTORY IN OLD AGESOTHER AETIOLOGIES ARE ALCHOHOLIC PATIENT RUPTURE ANEURYSMA COAGULATION ARACHNOID CYSTA BRAIN TUMOR AND DECREASED INTRA CRANIAL PRESSURE LIKE POST VP SHUNT
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