Well-Differentiated Mucinous Cystadenocarcinoma of the Renal Pelvis

Adenocarcinoma arising from renal pelvis is uncommon. A mucinous cystadenoma of the renal pelvis with malignant transformation is a rare entity. We report a case of well-differentiated mucinous cystadenocarcinoma of the renal pelvis with malignant transformation of cystadenoma with mucus-filled kidney (muconephrosis) due to mucin produced by the tumor .