Rapid Spontaneously Disappearance of Acute Subdural Hematomas: Analysis of 31 Cases

We reviewed 31 cases of acute thin subdural hematomas including those reported in the literature and our own which had disappeared spontaneously within 72 hours post-trauma. The subdural hematomas in these cases were detected mostly within 60 min after injury. A significant decrease in hematoma size was demonstrated at as early as 2 hours after injury. It seems therefore that the earlier the initial CT scan was taken, the more frequently acute thin subdural hematomas which rapidly disappeared could be detected. The hematomas did not explain clinical conditions on admission. Brain swelling and cardiorespiratory failure appeared to be responsible for poor outcome. Repeated CT scans and careful observation of the neurological changes is recommended before undertaking surgical intervention in such cases.