“…First, initial hemorrhage in the subarachnoid space is the primary lesion that eventually dissects into the subdural space, and the subarachnoid hemorrhage is washed out by the cerebrospinal flow through the transitional state, 6,7,9,16,17) as supported by observations of the transitional state of combined subarachnoid hem-Spontaneous Remission of a Spontaneous SCSDH orrhage and subdural hematoma. 2,7) Second, spinal subdural hematoma might be related to the redistribution of blood from the intracranial subdural space, and expansion may be secondary to chronic changes, 1) supported by a possible association between SCSDH and intracranial chronic subdural hematoma.…”