Armed Forces Institute of Pathology (AFIP) - Department of Veterinary PathologyY

Histological Classification of Tumors of the Urinary System of Domestic Animals

Renal Tumors
1 Epithelial Tumors: 1.1 Adenoma; 1.2 Carcinoma; 1.2.1 Renal adenocarcinoma; 1.2.2 Transitional cell carcinoma; 1.2.3 Squamous cell carcinoma; 1.2.4 Undifferentiated carcinoma; 1.3 Oncocytoma
2 Embryonal Tumors: 2.1 Nephroblastoma (embryonal nephroma); 2.2 Thoracolumbar spinal cord tumor of young dogs (nephroblastoma)
3 Mesenchymal Tumors: 3.1 Tumors of vascular tissue; 3.1.1 Hemangioma; 3.1.2 Hemangiosarcoma; 3.2 Tumors of fibrous tissue; 3.2.1 Fibroma; 3.2.1.1 Renal interstitial cell tumor
4 Metastatic Tumors: 4.1 Lymphoma; 4.2 Hemangiosarcoma; 4.3 Carcinoma
5 Tumorlike Lesions: 5.1 Malformations; 5.1.1 Hamartoma; 5.1.2 Telangiectasia; 5.2 Granulomas; 5.3 Cysts; 5.3.1 Solitary cyst; 5.3.2 Multiple cysts (polycystic kidney)
Renal Pelvis and Ureteral Tumors
1 Epithelial Tumors: 1.1 Transitional cell carcinoma; 1.2 Papilloma
2 Mesenchymal Tumors: 2.1 Hemangioma
Urinary Bladder Tumors
1 Epithelial Tumors: 1.1 Papilloma; 1.2 Adenoma; 1.3 Carcinoma; 1.3.1 Transitional cell carcinoma; 1.3.1.1 Papillary and infiltrating; 1.3.1.2 Papillary and noninfiltrating; 1.3.1.3 Nonpapillary and infiltrating; 1.3.1.4 Nonpapillary and noninfiltrating (carcinoma in situ); 1.3.2 Squamous cell carcinoma; 1.3.3 Adenocarcinoma; 1.3.4 Undifferentiated carcinoma
2 Mesenchymal Tumors: 2.1 Tumors of skeletal muscle; 2.1.1 Rhabdomyosarcoma; 2.1.1.1 Botryoid rhabdomyosarcoma; 2.2 Tumors of smooth muscle; 2.2.1 Leiomyoma; 2.2.2 Leiomyosarcoma; 2.3 Tumors of vascular tissue; 2.3.1 Hemangioma; 2.3.2 Hemangiosarcoma; 2.4 Tumors of fibrous tissue; 2.4.1 Fibroma; 2.4.2 Fibrosarcoma
3 Secondary Tumors: 3.1 Lymphoma
4 Tumorlike Lesions: 4.1 Polypoid cystitis; 4.1.1 Polypoid eosinophilic cystitis; 4.2 Polyp; 4.3 Metaplasia; 4.3.1 Glandular metaplasia (cystitis glandularis); 4.3.2 Squamous metaplasia; 4.4 runn's nests
Urethral Tumors
1 Epithelial Tumors: 1.1 Squamous cell carcinoma; 1.2 Transitional cell carcinoma