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Putative mechanism of development of primary retroperitoneal cystadenocarcinoma in metaplasia of the remnant coelomic epithelium hypothesis; (a) invagination of the coelomic epithelium cells, (b) trapping in the retroperitoneum during embryonic development, (c) transformation from coelomic epithelial remnant to mucinous epithelium, formation of (d) cystadenoma or (e) cystadenocarcinoma.
