Large Colloid Cyst in Cavum Vergae

 

Large Colloid Cyst in the roof of the Third Ventricle in Cavum Vergae - posteriorly in the Third Ventricle.  As usual there is no enhancement. CT with contrast shows higher attenuation due to cholesterol component of the fluid (mucin) in the cyst. Note higher than CSF signal on FLAIR and T2. There is no hydrocephalus and no oedema. You can compare it to other Large Colloid Cyst expanding more anteriorly and the most typical in size and location Colloid Cyst - in the roof of the Third Ventricle near Foramina Monroi. Note small "dots" on the superior aspect of the Colloid Cyst representing Internal Cerebral Veins - that are not compromised. 

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