Findings:
Centered within the left aspect of the pituitary gland is a rounded T1 and T2 hypo-enhancing lesion measuring 4 x 3.5 mm. On postcontrast images it enhances less than the surrounding pituitary gland. Pituitary tissue is mildly elevated upwards, but not extending into the suprasellar cistern. No chiasmal contact or compression.
The infundibulum remains central in position with normal thickness.
The cavernous sinuses are unremarkable.
Marked background of small vessel ischaemic disease. The brain parenchyma is otherwise unremarkable.
The ventricles and sulcal spaces are within normal limits. No midline shift.
The orbits, paranasal sinuses and mastoid air cells are clear.
No bony abnormality is seen. The craniocervical junction is normal.
Conclusion:
Features consistent with a pituitary microadenoma in the left anterior pituitary.