Head CT > Trauma > Cerebral Contusion


Cerebral Contusion

Cerebral contusions are the most common primary intra-axial injury. They often occur when the brain impacts an osseous ridge or a dural fold. The foci of punctate hemorrhage or edema are located along gyral crests. The following are common locations:
- Temporal lobe - anterior tip, inferior surface, sylvian region
- Frontal lobe - anterior pole, inferior surface
- Dorsolateral midbrain
- Inferior cerebellum
On CT, cerebral contusion appears as an ill-defined hypodense area mixed with foci of hemorrhage. Adjacent subarachnoid hemorrhage is common. After 24-48 hours, hemorrhagic transformation or coalescence of petechial hemorrhages into a rounded hematoma is common.



Multiple foci of high density corresponding to
hemorrhage (arrows) in an area of low density
(arrowheads) in the left frontal lobe due to cerebral contusion.


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