PMC5437786_01
Preoperative sagittal magnetic resonance imaging noting hyperintensity at outlet of ectopically placed fourth ventricular outlet
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F1
It was decided that a Chiari II decompression was warranted [Figure 1].
Operative image of the posterior fossa noting the fourth ventricular outlet. Note the dermoid located near the ectopic choroid plexus of the fourth ventricle
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F2
Deep to the choroid plexus, desquamated epithelium, and hair were observed [Figure 2].
Follow-up sagittal magnetic resonance imaging at 10 years of age showing no sign of posterior fossa dermoid
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F3
Follow-up scan at 10 years of age showed no signs of posterior fossa dermoid [Figure 3].