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[[Image:renal carcinoma.jpg|right|thumb|125px|<small><center>'''Renal carcinoma'''. Courtesy of T. Scase</center></small>]]
*'''Primary renal tumours''' are uncommon and comprise less than 1 percent of total neoplams.
**Renal adenomas are rare and are usually incidental findings.
**Renal adenocarcinomas are the most common primary neoplasm in older dogs, cattle and sheep. Lesions are typically unilateral, friable, with local necrosis and haemorrhage. Metastasis to the lungs is common.
**Nephroblastomas (Wilms' tumour) are embryonal tumours of mesenchymal origin. They are the most common primary renal tumour of pigs and chickens.
*'''Metastatic renal tumours''' include lymphosarcoma in the cat and haemangiosarcoma, malignant melanoma and mammary adenocarcinoma in the dog.