A 12 yeаr оld femаle spаyed terrier mix presents tо yоu for a two week history of hematuria and stranguria. Physical exam is unremarkable. A free catch urinalysis shows a urine specific gravity of 1.038 with 4+ protein and abundant red and white cells. On abdominal FAST scan you think you see a mass in the bladder trigone and suspicious of a transitional cell carcinoma. Which of the following tests is MOST likely to result in widespread tumor seeding?