PMC4921191_01
Noncontrast CT of the brain shows multiple small foci of low density (HU-80), distributed in the lateral ventricles and basal cisterns (white arrows).
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Noncontrast CT scan of the head (Fig. 1a) showed multiple locules of low density, with a distribution in the suprasellar and prepontine cisterns and in the lateral and third ventricles. The largest locule was found in the left paracavernous area, measuring 17mm x 8mm, with an attenuation of -80HU (consistent with fat) (Fig. 1b). Anterior to this was a 10mm focus of clumped calcification (Fig. 1c).
Ovoid left paracavernous lesion (white arrow) represents dermoid cyst.
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T1-weighted MRI of the head (Fig. 2A, Fig. 2B) demonstrated a corresponding high signal in all locations, confirming the presence of cholesterol. The CT and MRI findings were therefore pathognomonic of a ruptured intracranial dermoid cyst.