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Dermoid Cyst

Last Updated: October 1, 2018

Figure 1: 34-year-old male presenting with dizziness and migraine headaches. (top row left) Contrast enhanced T1-weighted image demonstrates a heterogeneous-appearing mass in the right temporal lobe demonstrating areas of hyperintensity both internally and in the periphery (arrow). These areas were also bright before the administration of contrast, implying blood products or fat. The similarly bright material layering non-dependently in the frontal horns of the lateral ventricles (arrows, top row right) represents fatty material (sebum) due to rupture of the cyst/tumor. Postoperative head CT (bottom row left) also demonstrates this fat-density material in the frontal horns (arrows) that can be easily mistaken for postoperative pneumocephalus unless window/level adjustments are properly made and evaluated (bottom row right, arrows).