Case 7

Basic clinical data 78-year-old Caucassian male Tumor of the right ureter and renal pelvis No evidence of metastatic disease or another primary tumor No hormonal dysbalance

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Common anoli Anolis carolinensis

Osteoclast-like giant cell tumor of renal pelvis Akhtar M, Aslam M, Lindstedt E, et al J Urol Pathol, 11, 1999:181-193

Modern Pathol 2005 Advance On-line Osteoclast-rich undifferentiated carcinomas of the urinary tract Baydar D, Amin MB, Epstein JI Modern Pathol 2005 Advance On-line

Pathological features No obvious malignant component within tumorous mass Probably favourable biological behavior Several similar cases were described but in connection with malignant urothelial component

Differential diagnostics Sarcomatoid RCC or TCC Primary osteosarcoma of the urinary bladder Variants of urothelial carcinoma with HCG pozitive elements, with giant multinuclear cells, etc.

Sarcomatoid TCC

Osteoclast-type giant cells within TCC

TCC with trophoblastic differentiation

Giant cell ca/undifferentiated carcinoma