Findings:
A cystic lesion is seen within the right Meckel’s cave with no nodularity or enhancement. The lesion elicits fluid signal intensity and extends posteriorly to the right cerebellopontine angle. This displaces and compresses the cavernous portion of the right trigeminal nerve. No involvement of the petrous apex. No abnormalities seen on the left side.
Mild involutional changes are seen in the brain parenchyma in the form of prominent cortical sulci and widened ventricles.There is no midline shift.
The brain parenchyma is unremarkable. No diffusion restriction.
Mucosal thickening is seen in the paranasal sinuses bilaterally. The mastoid air cells are clear.
No bony abnormality is seen.
Conclusion:
Cystic mass lesion in the right Meckel’s cave is likely in keeping with a small arachnoid cyst extending from the right cerebellopontine angle to the right Meckel’s cave. No nodular or enhancing components.