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A: Non-contrast-enhanced CT scan of the head showing a large CSF-density lesion measuring approximately 9 cm × 5 cm, together with expansion, thinning, and marked scalloping of the occipital bone (arrows). B: Non-contrast-enhanced CT scan of the head showing a well-defined bony defect with smooth margins in the occipital bone (arrow). Note the communication with the subarachnoid space.
