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CT Study of Transtentorial Herniation due to Epidural Hematoma

Objective To analyze CT manifestations of transtentorial herniation due to epidural hematoma, and to study the relationship between the volume of the hematoma and the degree of the herniation.Materials and Methods Eighty six cases of epidural hematoma underwent CT study, with the scanning line perpendicular to the line from posterior clinoid process to the lowest point of the clivus (C C line).Results Transtentorial henia was diagnosed on CT in 36 cases, presenting as an isodensity mass attached to the temporal lobe and located medial to the tentorium in the ambient cistern. The hernias varied in size, being 3mm (n=4), 3～6mm (n=12), or 6mm (n=20). The volume of these different sized hernias was 30.99～34.81ml, 32.84～41.76ml and 39.15～69.54ml, respectively.Conclusion By using CT study with the scanning line perpendicular to C C line, tentorial herniation due to epidural hematoma can be accurately diagnosed. The volume of the hematoma is consistent with the degree of herniation.