The pituitary sits at the base of the brain, just below the optic nerves (optic chiasm) and above the sphenoid sinus — the natural pathway surgeons use to reach it through the nose.
Why MRI Is the Key Test
A dedicated pituitary MRI — usually with contrast, and sometimes a special "dynamic" technique for very small tumors — shows the pituitary in fine detail.
Tumor Size on MRI
MRI measures the tumor. Tumors are grouped as microadenomas (under 10 mm) or macroadenomas (10 mm or larger), which helps guide treatment.
Optic Chiasm and Cavernous Sinus
The MRI shows whether the tumor reaches up to the optic chiasm (which can affect vision) or extends sideways into the cavernous sinus, which can affect how completely it can be removed.
Incidental Findings
Many small pituitary tumors are found by chance on a scan done for another reason. These "incidentalomas" are usually harmless and are often simply monitored.Become our Patient. Send us your MRI and recent bloodwork and our team will review your case. Call 813-333-1186 or fax records to 844-691-5928.