stage I medullary thyroid cancerListen to pronunciation(... MED-yoo-LAYR-ee THY-royd KAN-ser)Cancer is found in the thyroid only and the tumor is 2 centimeters or smaller.More InformationThyroid Cancer TreatmentEnlarge this image in new windowStage I medullary thyroid cancer. Cancer is found in the thyroid only and the tumor is 2 centimeters or smaller.Search NCI's Dictionary of Cancer TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#