J Korean Radiol Soc.  1988 Aug;24(4):514-519. 10.3348/jkrs.1988.24.4.514.

Reevaluation of CT findings of epidural hematomas

• Lee SH
• Park JS
• Song KS
• Kim KS

• KMID: 2359235
• DOI: http://doi.org/10.3348/jkrs.1988.24.4.514

Abstract

Homogeneous high density (of biconvex shape) has been the CT hallmark of epidural hematoma. High resolution CT demonstrated the structural detail of hematomas and as a result all the hematomas are no longer homogeneous.Authors reviewed CT findings of 27 lesions os epidural hematomas within 72 hours, of head injury and frouped into 4 types according to the denstiy homogeneity: type 1: well-defined low density area within hematoma type 2:ill-defined low density are within hematom(laminar, hole, or irregular) type 3: homogeneous high densityhematom(laminar, hole, or irreular) type 4: marginal low density area along hematoma Types and time intervalbetween head injury and CT examination are well correlated; The mean time durations of each typeare 2hr, 7.6hr, 15hr, and 53 hr in order. The lucency in type 1 represents active bleeding from meningeal artery or dural sinus.The inhomogeneity in type 2 is due to liquid blood within clots. The homogeneity in type 3 means complete clotformation. The marginal low density in type 4 reflects retraction of blood clot.

MeSH Terms

Craniocerebral Trauma
Hematoma*
Hemorrhage
Meningeal Arteries