1. Case 5

2. Basic clinical and pathological data
64-year-old female
Tumor of the kidney in the vicinity of renal hilus
4 x 3 x 3 cm
Whitish, well circumscribed

3. ????

4. Spider- harvestman

5. Immunohistochemistry
Negative reactions: EMA, WT1
Positive reactions: AE1-AE3, weakly CAM 5.2, MIB 1 (Ki 67): 2-10 cells/hpf

6. Metanephric adenoma

7. Arroyo 1999: Metanephric tumors group
Metanephric adenoma
Metanephric adenofibroma
Metanephric stromal tumor

8. Metanephric adenoma Close relationship to Wilms tumor
Close relationship to papillary RCC
Combinations were rarely described