|Print Date:||May 21, 2013, 4:48 pm|
|Text||Colloid cysts are an uncommon tumor of the cerebral ventricular system. They arise from the inferior aspect of the septum pellucidum or choroid plexus and extend anteriorly and inferiorly into the third ventricle.
Pathologically it is made up of epithelial with scant surrounding connective tissue. The lining has ciliated columnar or cuboidal cells, as well as mucin-producing goblet cells.
Colloid cyst typically presents in young adulthood, and have a male predominance. Due to itâ€™s precarious location, the mass can act as a ball-valve on the foramen of Monroe causing transient obstruction and positional headaches. Other presenting complaints include change in mental status, gait instability, and dementia.
Imaging typically demonstrates a third ventricular mass with or without ventricular enlargement and sellar erosion can occur due to chronic hydrocephalus. Due to its proteinaceous contents, the cyst will usually appear iso/hyperdense on noncontrast CT, and hyperintense on both T1 and T2 weighted imaging. Less than 30% of the time, the cyst will demonstrate imaging characteristics similar to CSF. Enhancement is not characteristic; however minimal enhancement of the borders may be seen which is usually due to choroid at its periphery.
|References:||Osborn, Requisites, Dahnert|
|Contributor||Amy H. Martin, M.D. (National Naval Medical Center Bethesda)|
|Peer Reviewer||James G. Smirniotopoulos, M.D. (Uniformed Services University)|
|Record Number||: 2802|
|Location:||Brain and Neuro|
|MedPix® Medical Image Database |
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