Fig. 2

Microscopic findings of resected renal pelvic tumor (H&E stain). Squamous cell carcinoma is chosen in well-differentiated areas of the tumor (a, 10 × 10 μm; H&E stain; b, 40 × 10; H&E stain). Sarcomatoid morphology and residual glomerular structures are seen in poorly differentiated areas (c, 10 × 10 μm; H&E stain). Squamous differentiation in tumoral areas is prominent (d, 10 × 10 μm; H&E stain)