What are the MRI findings of pituitary adenoma?

MRI refers to magnetic resonance imaging. Pituitary adenomas on MRI typically appear as hypointense signals on T1-weighted images, are often located unilaterally within the pituitary gland, and show hyperintense or isointense signals on T2-weighted images. The specific details are as follows:

1. Hypointense signal on T1-weighted imaging

When examined via magnetic resonance imaging, pituitary adenomas usually present as hypointense (low signal intensity) on T1-weighted images, while appearing isointense on proton density-weighted imaging.

2. Pituitary adenomas are often located on one side of the pituitary gland

Imaging findings often reveal asymmetric upward bulging of the tumor into the sellar cavity, displacement of the pituitary stalk, and tilting of the sellar floor—these are indirect signs indicative of a pituitary adenoma.

3. Hyperintense or isointense signal on T2-weighted imaging

On T2-weighted images, pituitary adenomas typically appear as isointense or hyperintense (high signal intensity) with relatively uniform signal intensity. They may also be associated with calcification, hemorrhage, necrosis, or cystic changes.

If a patient is suspected of having a pituitary adenoma, MRI is highly valuable for evaluating the presence of skull bone artifacts, assessing tumor characteristics, determining whether hemorrhage exists, evaluating the softness or hardness of the lesion, and identifying possible involvement of surrounding tissues. Therefore, patients who are suspected of having a pituitary adenoma should promptly seek medical evaluation at a hospital to confirm the diagnosis and receive targeted treatment.