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| + | Neoplasia of the bladder is most commmon in dogs, cats and cattle. |
| + | ===Benign tumours=== |
| + | ===Leiomyoma=== |
| + | *Occur in the smooth muscle of the bladder wall. |
| + | *May be single or multiple, well defined white nodular projections. |
| + | *If situated at the neck of the bladder, they can disrupt urinary flow. |
| + | ===Papilloma=== |
| + | *Bladder papillomas are uncommon. |
| + | *Will often recur following excision. |
| + | *Can lead to carcinomas. |
| + | ===Botryoid rhabdomyosarcoma=== |
| + | *Occurs in the bladder and less commonly the urethra of large breed dogs less than 18 months of age. |
| + | *Embryonic myoblasts may be the origin. |
| + | *Appears as a large fungating mass, usually at the trigone of the bladder. |
| + | *Highly infiltrative and metastatic. |
| + | ===[[LUT Vascular - Pathology#Haemorrhages|Bovine enzootic haematuria]]=== |
| + | ==Malignant tumours== |
| + | ===Transitional cell carcinoma=== |
| + | *Most relevant in dogs and cats. |
| + | *Spreads along and through the bladder wall. |
| + | *Destroys the epithelium and invades the muscle layers. |
| + | *Metastasis to regional nodes and the lungs occurs in approximately 50% of cases. |
| + | **Can also spread to the peritoneum or in a retrograde manner to the soft tissue and bone of the hindlimbs. |
| + | ===[[LUT Vascular - Pathology#Haemorrhages|Bovine enzootic haematuria]]=== |