PMC3205935_01
Cystic lesion, originated from renal pelvis, and containing multilocular cystic structure divided by contrasted septate and covered with calcified wall in 7 x 6 x 6 cm size (Bosniak-IIF), was displayed on contrast-enhanced computerized tomography.
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fig1
Cystic lesion, originated from renal pelvis, containing multilocular cystic structure divided by contrasted septate, and covered with calcified wall in 7 x 6 x 6 cm size (Bosniak-IIF) was displayed on contrast-enhanced computerized tomography (Figure 1). 
Grossly, a tumor which was 7 cm in size originated from renal pelvis and expanded to the upper pole. The mass was filled with chocolate color mucinous fluid.
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fig2
Grossly, the tumor was a multilocular cystic mass filled with chocolate color mucinous fluid (Figure 2).
Adenoid structures formed by multilayer atypical epithelial cells and interstitial mucine lakes.
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fig3
Histologically, multilayered tall columnar mucinous epithelium forming the cyst wall and resembling intestinal and endocervical epithelium, was seen gaining gradual malignancy potential with formation of glands of different sizes and shapes lined by columnar cells having hyperchromatic and pleomorphic nuclei, and eosinophilic-to-vacuolated cytoplasm (Figure 3).