Early diagnosis of renal pelvis villous adenoma: A case report

Figure 1 Urinary system computed tomography scan. A: Right kidney stones with hydronephrosis and upper ureteral dilatation; B: No obvious suspicious space-occupying lesions in the right renal pelvis were seen on the contrast-enhanced computed tomography scan.

Figure 2 The biopsy results. A: Multiple papillary space-occupying masses visible during the percutaneous nephroscopy; B: Villous appearance of the lesion shown with hematoxylin-eosin staining (× 100).

Figure 3 Gross pathology of the resected right kidney and ureter. A: A large amount of gelatinous mucinous fluid was found in the renal pelvis and calyces; B: A hard solid mass about 2.5 cm 2.0 cm in size was found in the middle pole of the kidney. Furthermore, there was a stone about 1 cm in the mass and a papillary neoplasm below the mass.

Figure 4 Histological and immunohistochemical findings. A: Hematoxylin and eosin staining of the specimen from the lesion showed a villous appearance (× 100 magnification); B: Immunohistochemical results showed that cytokeratin 7 was positive; C: Immunohistochemical results showed that cytokeratin 20 was positive.