CT has been established as an indispensable tool in the detection of intracranial hemorrhages, Extraaxialfluid collections are usually easily distinguished from intracerebral hemorrhages. However, hemorrhages inatypical locations, such as in falx and tentorial regions, can be difficult to diagnose with CT. The tentorial andfalcial collection of subdural blood are rather unusual. Authors report here 84 cases of falcial and tentoralsubdural hemorrhages with reference data that we have encountered in the last two years. The result were asfollows; 1. In 589 cases of intracranial hemorrhage, the incidence of subdural hemorrhage was 372 cases(63.2%). 2.Among 372 cases with subdural hemorrhage, 84 cases(22.6%) had falcial &/or tentorial subdural hemorrhage. In 84cases with falcial &/or tentorial subdural hemorrhage, there were 50 caes(13.4%) of falcial subdural hemorrhages,21 cases(5.7%) of tentorial subdural hemorrhage and 13 case(3.5%) of combined falcial & tentorial subdural hemorrhage. 3. The location of falcial subdural hemorrhage was anterior in 30 cases(60%), posterior in 15cases(30%) and middle in 5 cases(10%). 4. The location of tentorial subdural hemorrhage was petrous edge in 7cases(33.3%), occipital attachment in 6 cases(28.6%), tentorial hiatus in 5 cases(23.8%) ,and diffuse in 3cases(14.3%). 5. In 13 cases showing combined falcial & tentorial subdural hemorrhage, there was 3 cases(23.1%) ofpostrior falc & tentorial hiatus, 2 cases(15.4%) of anterior falx & petrous edege, 2 cases of anterior falx & tentorial hiatus, 2 cases of posterior falx & petrous edge, 2 cases of posterior falx & occipital attachment, 1case(7.7%) of posterior falx & diffuse, and 1 case of posterior, middle falx & diffuse. 6 In the cases with falcial &/or tentorial subdural hemorrhage, the incidence of associated intracranial hemorrhage were intracranialsubdural subdural hemorrhage in 40 cases(47.6%), hemorrhagic brain contusion in 16 cases(19.0%), subarachnoidhemorrhage in 11 cases(13.1%), epidural hemorrhage in 9 cases(10.7%), combined subarachnoid & intracerebral hemorrhage in 5 cases (6.0%), & combined subdural & epidural hemorrhage in 3 cases(3.6%). 7. The prognosis offalcial &/or tentorial subdural hemorrhage was related to degree and location of associated intracranial hemorrhage, ans surrounding brain edema, contusion or both, but the existence, location and amount falcial &/ortentorial subdural hemorrhage itself were not affected motality and morbidity.