[Retroperitoneal mucinous cystadenocarcinoma presenting seven years after appendectomy and right hemicolectomy].

Retroperitoneal mucinous cystadenocarcinoma (RMC) with no involvement of neighboring structures is very rare, regardless of whether the lesion is primary or secondary. We report the case of a patient who presented RMC seven years after appendectomy and right hemicolectomy. We discuss both diagnostic possibilities.