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A 57 year-old man presented with intermittent severe headaches.
(Left) Axial Flair MRI; (Middle) T1-weighted axial MRI; (Right) Coronal T1-weighted MRI with Gadolinium. Note the colloid cyst (yellow arrow) in the anterior third ventricle which is obstructing both foramen of Monro. There is associated hydrocephalus of the lateral ventricles. On the Flair image, the transependymal edema can be seen capping the anterior and posterior horns of the lateral ventricles. Colloid cysts may be asymptomatic. However, if they enlarge, they may result in non-communicating hydrocephalus. Classically, they result in intermittent severe headaches from intermittent obstruction of the foramen of Monro.
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