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Ruptured intracranial dermoid cyst
  1. David J T McArdle1,2,
  2. Sumit J Karia2
  1. 1Department of General Medicine, Royal Hobart Hospital, Tasmania, Australia
  2. 2Department of Neuroradiology, John Radcliffe Hospital, Oxford University Hospitals, Oxford, UK
  1. Correspondence to Dr David J McArdle, Department of General Medicine, Royal Hobart Hospital, GPO Box 1061, Hobart, Tasmania 7001, Australia; david.mcardle{at}ths.tas.gov.au

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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 …

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