Pineal cyst

Case contributed by Assoc Prof Frank Gaillard


Vague headaches.

Patient Data

Age: Adult
Gender: Male

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.

Figure 1: the pineal cyst (blue arrows) compresses the tectal plate (orange arrow). 

Figure 2: splayed internal cerebral veins (blue arrows) should not be mistaken for nodular enhancement. 

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). 

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.