anaplastic thyroid cancerListen to pronunciation(A-nuh-PLAS-tik THY-royd KAN-ser)A rare, aggressive type of thyroid cancer in which the malignant (cancer) cells look very different from normal thyroid cells.More InformationThyroid CancerSearch NCI's Dictionary of Cancer TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#