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Noninvasive, microinvasive, and invasive mucinous carcinomas of the ovary

Whether ovarian mucinous tumors with epithelial stratification of more than three cell layers in the absence of stromal invasion (i.e., carcinomas diagnosed according to the Hart and Norris criteria) should be placed in the same category as mucinous tumors with stromal invasion (i.e., unquestionable carcinomas) remains controversial. Because individual mucinous tumors frequently contain benign, borderline, and malignant components, the adequacy of sampling has been emphasized.