On the Classification of Subdural Collection of Fluid

One of the complications which follow injury of the head is the accumulation of fluid between the dura and brain surface. Since the terminology of such lesion is still undivided and this lesion have been called various name like "meningitis serosa traumatica", "traumatic arachnoiditis", "subdural hygroma" and subdural effsion. The athors analyzedu this lesion and classified into three types by operative findings and advocated each name. 1. Subdural hygroma： It has a new membrane in which contains of fluid. 2. Subdural effusion： It has collection of fluid between dura and arachnoid without a new membrane. 3. Subarachnoid dilatation： It is easily confused with above two types, but accumulation of fluid is in the subarachnoid space. This type is also seen under the epidural and subdural hematoma and depressed fracture. Subdural hygroma is divided into three subgroups clinically.