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Rounded 6.6mm lesion identified in the roof of the third ventricle in the region of foramina of monroe which is T2 hypointense and T1 hyperintense to CSF with no enhancement. No diffusion restriction.
Hydrocephalus and periventricular FLAIR signal most prominently at the occipital horns in keeping with transependymal oedema.
The remaining brain parenchyma is unremarkable.
Patient went on to have a resection.
Sections show a thin walled cyst lined by a layer of ciliated cuboidal epithelium. No goblet cells are identified. The epithelial lining is arranged on a layer of loose fibrous tissue. The cyst contents comprise acellular amorphous material. The features are of a colloid cyst.
FINAL DIAGNOSIS: Third ventricle colloid cyst and contents.
Typical appearances of a colloid cyst.