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History of headache and dizziness. No history of trauma.
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Prominent retro-cerebellar CSF space with scalloping of inner table of occipital bone is seen. Extra-axial CSF space is also prominent.
Features described in the above lesion gives us two differential diagnosis. There is also presence of age related brain parenchymal volume loss. Differentials are :
- Retrocerebellar arachnoid cyst
- Mega cisterna magna