The cartilage cells showed positivity for 5100 and vimentin while epithelial cells were positive for pan keratin. Thus the diagnosis was established as carcinosarcoma. Carcinosarcoma of the urinary bladder is a rare malignant tumour, composed of mesenchymal and epithelial elements. It occurs predominantly in elderly males and is often in an advanced stage of presentation and rapidly becomes lethal. Gross haematuria, dysuria and urinary tract infections are the main presenting symptoms cytoscopically, the tumours appear as sessile, pedunculated or polypoid.
Diagnosis is confirmed by immunohistochemistry.
These tumours are best managed by radical surgery with or without adjuvant therapy.