Figure 7. Female, four months old, on admit after apparent life threatening event (ALTE). Note extra space around brain at single arrows: bilateral subdural hygromas filled with cerebral spinal fluid (CSF). This fluid is generally described as “hypodense”or “attenuated” on computed tomography. This darker grey is consistent with density of CSF or a mixture of xanthochromic CSF and older blood. Slightly splayed sutures are noted in several locations (double arrows).