stage 0 Merkel cell carcinoma in situListen to pronunciation(stayj … MER-kul sel KAR-sih-NOH-muh in SY-too)Abnormal Merkel cells are found in the top layer of the skin. These abnormal cells may become cancer and spread into nearby normal tissue.More InformationMerkel Cell Carcinoma TreatmentSearch NCI's Dictionary of Cancer TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#