Neuroradiology
Teaching FileNeuroradiology
Teaching File
CT image with contrast demonstrates an isodense subdural hematoma in the left frontoparietal region.
Subdural hematomas which become symptomatic between 3 days and 3 weeks after initial injury are considered subacute. Compared to the normal brain parenchyma, subacute subdural hematomas appear isodense to low density. These collections may be subtle, especially if they are bilateral. Medial displacement of the gray-white matter interface is an important finding to identify.
The subdural membrane surrounding the hematoma will enhance with contrast, allowing easier identification of the isodense SDH. Delayed scans may show layering of contrast in the extracranial collections. This is due to leakage from the vascular subdural membrane.