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Computed tomograms of BALB/c nude mice during transurethral instillation of tumor cells. Mice are in supine position. A sagittal plane is shown. a The mouse was catheterized and tumor cells were injected after connecting the syringe. Because of the air present in the catheter an air bubble is formed in the urinary bladder (visible as bright region). b The catheter was filled with tumor cell suspension prior to catheterization and no air bubble is apparent in the bladder
