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Vetdle Archive

Archive Case #213: Canine Transitional Cell Carcinoma

Dog veterinary case - Medium - October 2, 2026

Clinical Clues

  1. Bonnie, an eleven-year-old Scottish terrier, asks to go outside every few minutes.
  2. She strains, passes small amounts of urine and intermittently leaves blood-tinged spots.
  3. Properly collected urine cultures show no bacterial growth, but the lower urinary signs persist.
  4. Ultrasound identifies an irregular, attached mass near the bladder trigone.
  5. Urinary cytology shows markedly atypical epithelial cells, prompting tissue sampling rather than assuming uncomplicated cystitis.
  6. A cystoscopically obtained biopsy confirms invasive urothelial carcinoma, also called transitional cell carcinoma.

Diagnosis

Canine Transitional Cell Carcinoma

The biopsy establishes the tumour type. Persistent urinary signs and a trigonal mass raise suspicion, but inflammation can also produce concerning findings. Negative cultures do not by themselves prove cancer. Remember: A persistent bladder problem deserves reassessment; a mass needs an appropriate diagnostic work-up.

Learning review

Review the case evidence

Use the paired clues to explain how the evidence in this dog case supports the provided diagnosis, Canine Transitional Cell Carcinoma, then compare your reasoning with the case explanation.

Evidence checkpoints

Clues 1-2

  1. Clue 1: Bonnie, an eleven-year-old Scottish terrier, asks to go outside every few minutes.
  2. Clue 2: She strains, passes small amounts of urine and intermittently leaves blood-tinged spots.

Clues 3-4

  1. Clue 3: Properly collected urine cultures show no bacterial growth, but the lower urinary signs persist.
  2. Clue 4: Ultrasound identifies an irregular, attached mass near the bladder trigone.

Clues 5-6

  1. Clue 5: Urinary cytology shows markedly atypical epithelial cells, prompting tissue sampling rather than assuming uncomplicated cystitis.
  2. Clue 6: A cystoscopically obtained biopsy confirms invasive urothelial carcinoma, also called transitional cell carcinoma.

Self-review prompts

  1. After clues 1-2, what evidence from this dog case shaped your initial interpretation?
  2. When you compare clues 3-4 with clues 1-2, what changed in your reasoning about Canine Transitional Cell Carcinoma?
  3. How do clues 5-6 align with the case explanation for Canine Transitional Cell Carcinoma?

Educational Use

Vetdle archive cases are educational veterinary games for diagnostic reasoning practice. They do not provide veterinary advice, diagnosis, treatment, or professional medical guidance.