Pituitary tumors are grouped by size. Microadenomas are under 10 mm; macroadenomas are 10 mm or larger and are more likely to press on the optic nerves and affect vision.
What the Sizes Mean
Doctors divide pituitary tumors by size: a microadenoma is smaller than 10 mm, and a macroadenoma is 10 mm or larger.
Why Size Matters
Larger (macro) tumors are more likely to press on the optic nerves and cause vision loss or crowd out the normal gland. Smaller (micro) tumors more often come to attention through hormone symptoms or as an incidental finding.
Treatment Implications
A small, non-functioning microadenoma is often simply watched, while a macroadenoma affecting vision usually needs surgery. Size is one factor among several.
"My MRI Says a 12 mm Tumor"
A specific measurement on your report does not tell the whole story — what matters is the tumor type, whether it affects vision, and whether it is making a hormone. We are glad to review your MRI and explain what it means for you.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.