Nonmucinous tumors will demonstrate a spectrum ranging from very low tointermediate signal intensity—corresponding to fibrosis and viable tumortissue, respectively(24).Mucinous tumors (i.e., those with > 50% mucin at baseline), tumors withmucinous features (i.e., those with < 50% mucin at baseline), and tumorsundergoing mucinous/colloid degeneration (i.e., those beginning to producemucin after NAT) may demonstrate different degrees of mucin content,fibrosis, and viable tumor tissue(25). Here, MUC5AC is linked to neoplasm.