PMC10321782_01
Head CT (A) and MRI (B-D). A - A CT scan showed a hypodense crescentic collection in the subdural space (arrow) with a mild mid-line shift. A swollen mass was also seen on the right frontal head; B - A FLAIR image showed low signal intensity in a crescentic formation surrounded by a peripheral hyperintense rim; C - DWI showed that the crescentic cavity consisted of internal hypointensity and linear hyperintensity of the dura mater extended to the right frontal contusion site. The subcutaneous mass on the right frontal head, an adjacent frontal bone, and lobe also showed a restrictive pattern, most likely indicating a subdural hematoma accompanied by bone and brain contusions; D - The ADC value of the central area of the crescentic collection was high, whereas its peripheral region showed a low ADC value.
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A non-contrast brain CT scan revealed a subdural hypodense collection in a crescentic formation along with the right convexity and mild mid-line shift toward the left side (Figure 1A). MRI showed that the crescentic region had low signal intensity surrounded by a peripheral hyperintense rim on fluid-attenuated inversion recovery (FLAIR) images (Figure 1B). The diffusion-weighted imaging (DWI) showed an internal hypointensity cavity associated with surrounding hyperintensity signals similar to the FLAIR sequence images (Figure 1C). On the corresponding apparent diffusion coefficient (ADC) map, the central area of the crescentic collection had a high value, in contrast to the low value of the peripheral region (Figure 1D). T1- and T2-weighted images, respectively. The right frontal bone and frontal lobe just below the swollen mass also had hyperintensity on DWI with a low ADC value (Figure 1C, D).