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Colloid cysts of the third ventricle are benign epithelial lined cysts with characteristic imaging features. Although usually asymptomatic, they can rarely present with acute and profound hydrocephalus.
This case illustrates the typical appearance of a colloid cyst, a very important finding as they are associated with sudden death, and patients need to be referred for surgical assessment.
Colloid cyst. mri. A hyperdense (on CT) rounded colloid cyst (green arrow) is present in the roof of the third ventricle (yellow dotted line). The content of the cyst is hyperintense on T1 and markedly hypointense on T2 and FLAIR.
Colloid nodules are composed of irregularly enlarged follicles containing abundant colloid. A colloid nodule may be single or multiple and can vary considerably in size. Some colloid nodules can be cystic (cystic colloid nodule) and may contain areas of necrosis, hemorrhage and/or calcification.
Case Discussion. This MRI demonstrates typical characteristics of a third ventricular colloid cyst. Whereas the appearance on CT (not shown) is quite predictable, appearing as hyperdense non-enhancing nodule at the foramen of Monro in the roof of the third ventricle, on MRI signal characteristics are much more variable, depending on the ...
The section shows a cyst with surrounding brain parenchyma and choroid plexus. The lumen contains amorphous eosinophilic material. The cyst is lined by pseudostratified ciliated columnar epithelium. Rare cells have mucinous vacuoles in the cytoplasm. They show no atypical features.
A location-based approach is useful in establishing an appropriate diagnosis; some locations are virtually pathognomonic for certain lesions e.g. colloid cyst. Many cysts may occur in more than one location (midline or off-midline) e.g. arachnoid and epidermoid cysts.
Sections show the wall and lining of a cyst. The lining is composed of simple ciliated cuboidal epithelium in which no atypical features are seen. The wall is composed of loosely compacted. collagen. The features are of a colloid cyst. No evidence of tumor is seen. DIAGNOSIS: Third ventricle colloid cyst. Note: this is a duplicate case of case ...
Selected images from an MRI. In the roof of the third ventricle is a rounded lesion with low T2 and high T1 signal. No hydrocephalus. This is a characteristic appearance of a colloid cyst of the third ventricle.