A 69 year old man consulted his physician because of blood in his urine.He was referred to a urologist,who performed cystoscopy and bladder biopsy.A representative section of the biopsy is shown in the accompanying photomicrograph.Which one of the following is the best diagnosis?

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The papillary structure with a blood vessel core (BV)is easily appreciateDThis is papillary transitional cell carcinoma,which is often of low gradE

A 69 Year Old Man Consulted His Physician Because of Blood