Colloid Cyst (Transcallosal Approach)
Last Updated: September 29, 2018
Colloid Cysts represent 0.5-1% of intracranial lesions and are located within the third ventricular roof immediately adjacent to the foramen of Monro. These cysts uniquely contain a viscous gelatinous material and originate from abnormal folding of the primitive neuroepithelium (the paraphysis elements).
Colloid cysts can reach a substantial size and exceedingly rarely precipitate a sudden occlusion of the foramen of Monro, causing life-threatening acute obstructive hydrocephalus. The method of occlusion can be related to acute intracystic hemorrhage, postlumbar puncture transposition of the mass, or shunt malfunction.
In most cases, colloid cysts are asymptomatic and discovered incidentally.