Pyonephrosis as a sign of sarcomatoid carcinoma of the renal pelvis

Figure 1 Contrast enhanced abdominal computed tomography shows a dilated and unstructured right kidney. No mass effect images.

Figure 2 Macroscopic sagittal cut of the right kidney after nephrectomy, necrotic areas spread outside kidney and parenchyma is replaced by fibrotic tissue.

Figure 3 On the left side the sample (x 20) shows the invasive sarcomatoid pattern and on the right side the immunochemistry (x 40) positivity for CK7.