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Pineal cyst

Case contributed by: Dr Frank Gaillard

Presentation:

Vague headaches.

Patient Data:

Age: Adult
Gender: Male
Race: Caucasian

MRI brain

Modality: MRI

Selected images from a contrast enhanced MRI demonstrate an incidental 12mm cystic lesion in the region of the pineal gland. The tectal plate is somewhat distorted (best seen on sagittal T1 image) but there is no evidence of obstructive hydrocephalus. 

The cyst does not have any solid component and has fluid signal which does not however fully attenuate on FLAIR. There is no restricted diffusion on DWI/ADC. 

On the coronal post gad image the internal cerebral veins can be seen elevated and splayed.

Annotated images

Modality: Diagram

Case Discussion:

This case demonstrates typical appearances of an incidental pineal cyst. These are found in up to 5% of all brain MRIs, and as such pose a problem in deciding which should be followed up. 

In general large size (>10-12mm) or any atypical features warrant followup to ensure that they do not represent a cystic pineal neoplasm (e.g. pineocytoma). 

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