Case 2

This is a CT brain study. The salient finding is a mass in the left temporal lobe which shows mostly fatty attenuation with irregular calcification at the rim. There are defects and surgical clips in the adjacent temporal bone, indicating prior craniotomy. The left temporal lobe is atrophic and shows reduced attenuation, indicating encephalomalacia. 

There are also foci of fat density in the lateral ventricles, and in the subarachnoid space along the falx cerebri, basal cisterns and right CPA cistern.

These findings are characteristic of a ruptured intracranial dermoid cyst. There is no hydrocephalus.

I would compare with any prior imaging if available to compare the size of the cyst and assess for interval growth. I would also obtain contrast enhanced series if there is any suspicion of meningitis.