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===Primary tumours===
*Rare
*May arise from chest wall and mediastinum
====Mesothelioma====
*Has been found in cat, dog, cow, goat and horse
*Arise from pericardial, pleural and [[Peritoneal cavity - neoplastic#Primary tumours|peritoneal]] surfaces
*May be related to inhalation of asbestos
*Grossly:
**Multiple discrete nodules
*Microscopically:
**Can appear as a carcinoma or fibrosarcoma depending on which tissue, covering or supporting, is predominant in the neoplasm
*Rarely metastasise but are considered malignant
===Secondary tumours===
*Also rare
*May arise from transpleural dissemination of [[Lungs - hyperplastic and neoplastic|pulmonary tumours]] (carcinomas and sarcomas)
*Carcinomas from [[Peritoneal cavity - neoplastic#Secondary tumours|abdominal cavity]] may penetrate through diphragmatic lymphatics