The location of subdural hemorrhage over the cerebral hemisphere is so uniform that trephination of the squamous portions of both temporal bones of the skull or of both frontal and occipital bones generally is considered sufficient exploration to rule out the presence of such a hematoma if nothing of significance is seen. We have found this exploratory method inadequate in several instances.
The boundaries of the usual subdural hemorrhage may be described somewhat as follows: The clot covers the cerebral cortex from the tip of the frontal lobe to the tip of the occipital lobe. It is limited mesially by the superior longitudinal sinus; inferiorly, it rarely extends for any distance over the temporal lobe, the inferior border of the hemorrhage corresponding roughly to a line parallel with the sylvian fissure. Exceptions to this localization have been noted, but they are extremely rare. Dandy1 has seen a subdural hemorrhage
Aring CD, Evans JP. ABERRANT LOCATION OF SUBDURAL HEMATOMA. Arch NeurPsych. 1940;44(6):1296-1306. doi:10.1001/archneurpsyc.1940.02280120143014