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subarachnoid hemorrhage

• sensitivity of head CT for subarachnoid hemorrhage varies with time course:

           acutely             95-100%
           after 5 days          85%
           after 7 days          50%
  

• for chronic subdural hematoma: 97% sensitivity.

REF: MacNeil BJ, Abrams HL. Brigham and Women's Hospital Handbook of Diagnostic Imaging. Chapter 30.

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