[Cases of "delayed" subdural posttraumatic hygromas].

The authors present 6 cases of uni- or bilateral subdural hygromas that appeared a few weeks following severe head injury. Such hygromas were named by the authors as "delayed" ones. Surgical evacuation of hygroma resulted in patient's status improvement in all 6 cases, based on well-known theories of posttraumatic hygromas origin, the authors try to explain patomechanism of the "delayed" hygromas.