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CASE REPORTS
JOURNAL ARTICLE
[A resolving sign of acute subdural hematoma: from report of two cases].
No Shinkei Geka. Neurological Surgery 1998 November
A 7-year-old-boy (Case 1) and a 60-year-old-man (Case 2) presented with rare spontaneous resolution of acute subdural hematoma (ASDH). They were admitted with consciousness disturbance, drowsy in Case 1 and sleepy in Case 2. Initial CT showed ASDH associated with a low density band between the hematoma and the inner wall of the skull base, combined with right parietal contusion in Case 2. Repeat CT showed that the hematoma had resolved spontaneously after a few hours, and the patients regained clear consciousness next day in Case 1 within a few days in Case 2 without surgical treatment. The mechanism of spontaneous resolution of ASDH was thought to involve pulsatile flow of cerebrospinal fluid (CSF) through the tear in the arachnoid membrane, resulting in redistribution and dispersal of the hematoma, and retrograde flow into the subarachnoid space. The characteristic feature of the CT findings, the low density band between the hematoma and the inner wall of the skull bone, probably shows this process. Spontaneous resolution of ASDH requires that the brain compensatory function maintains the normal outflow of CSF, and controls the intracranial pressure by CSF buffering, blood outflow via the venous system, and brain elasticity. The low density band may be a useful finding to distinguish cases with good and bad prognosis.
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