Cellular origin of ovarian mucinous cystadenomas
Ovarian mucinous cystadenomas arise from ovarian surface epithelial tissue with mucinous (gastrointestinal-type) differentiation, most consistently supported by immunophenotypic continuity between mucinous and Müllerian-type ovarian epithelium. [1,2] Some mucinous tumors may additionally reflect a germ cell–related origin in cases showing association with mature cystic teratomas (dermoid cysts). [1,3]
Ovarian surface epithelium as the predominant source
Ovarian mucinous cystadenomas are lined by mucinous columnar epithelium that can resemble gastrointestinal-type epithelium, consistent with origin from ovarian epithelial tissue capable of mucinous metaplasia. [1] Intermediate patterns and transitions suggesting Müllerian-derived mucinous differentiation have been reported in ovarian mucinous cystadenomas. [2]
Müllerian versus gastrointestinal differentiation
Mucinous cystadenomas can show heterogeneity in epithelial phenotype, including Müllerian and gastrointestinal signatures. [2] Evidence of areas of transition between Müllerian-type and gastrointestinal-type epithelium supports derivation from Müllerian duct derivatives or ovarian surface epithelium exhibiting Müllerian metaplasia in the ovary. [2]
Germ cell–related origin in a minority subset
An association between mucinous cystadenomas and dermoid cysts indicates that some mucinous tumors may arise from germ cell–related tissue rather than exclusively from ovarian surface epithelium. [1,4]
Pathologic definition supporting an epithelial origin
Mucinous cystadenoma is defined as a benign cystic tumor lined by mucinous gastrointestinal-type epithelium. [5] This lining supports an epithelial origin rather than a mesenchymal origin. [5]
Practical clinical implication of the origin
Because the dominant source is ovarian surface epithelial tissue with mucinous metaplasia, mucinous cystadenomas are typically considered epithelial ovarian tumors rather than tumors of germ cell origin. [1,5]