Colloid cyst

Case contributed by Frank Gaillard



Patient Data

Age: Adult

CT brain


CT demonstrates an intermediate density spherical structure at the foramen of Monro with obstructive hydrocephalus (note transependymal edema). Following administration of contrast, a very thin peripheral enhancement is seen. Features are characteristic of a colloid cyst

Case Discussion

This case of a colloid cyst demonstrating thin peripheral calcification and thin enhancement with associated hydrocehpalus, is a little unusual, in that typically these cysts are more hyperdense on pre-contrast imaging. The presence of such florid hydrocephalus is also unusual as the majority of these lesions are found incidentally. Typical of lesions which cause hydrocephalus, is the larger size. 

This patient went on to have emergency surgery. 

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