Ruptured intracranial dermoid
Sudden onset headache and meningism.
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Two selected axial non-contrast CT images demonstrate hypodense material lying above the CSF in the frontal horns of the lateral ventricles, and around the pineal gland as well as smaller locules in the Sylvian fissures bilaterally and in the cerebellopontine cistern.
The differential would be of air / gas or fat which can be distinguished on windowing and Houndsfield unit measurment. In this case the material is confirmed to be of fat density, consistent with a ruptured intracranial dermoid.