Findings:
Tiny cystic lesion in the right peritrigonal white matter without any perilesional signal changes or enhancement on the postcontrast study, likely in keeping with an enlarged perivascular space. The brain parenchyma is otherwise unremarkable.
No abnormal signal on the diffusion/ADC images is identified. No evidence of any enhancing intra or extra-axial lesions on the postcontrast study.
The pituitary gland is normal.
The orbits, paranasal sinuses and mastoid air cells are clear.
No bony abnormality is seen. The craniocervical junction is normal.
Conclusion:
The known, tiny intra-axial cystic lesion in the right peritrigonal white matter shows no enhancement and no perilesional signal changes and it is likely compatible with a prominent perivascular space. No sinister pathology.