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A man in his late 60s presented with a sudden-onset headache, left-sided weakness and seizures. An unenhanced CT of the head showed a large low-attenuation lesion in his right frontal lobe with calcified borders, consistent with an intracranial dermoid cyst (figure 1). This cyst showed evidence of having ruptured, manifested by an adjacent collection containing a fat-fluid level and additional low-attenuation droplets in the subarachnoid space layering in the basal cisterns and cerebellar sulci. MR scan of the brain further supported this diagnosis …
Contributors Both authors contributed equally to the manuscript.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed. This paper was reviewed by Mark Manford, Cambridge, UK.