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TUMOUR

Definition

Literally means any swelling but, by common consent the term is not held to include passing swellings caused by acute inflammation or granuloma. It should be restricted to neoplasms, of which there are two categories: (a) benign or simple, which grows slowly at one spot, pressing neighbouring parts aside but not invading them, and normally not doing any harm to the animal, and (b) malignant or invasive, which is an abnormal mass of tissue, the growth of which exceeds and is uncoordinated with that of other tissues and persists in the same excessive manner after the cessation of the stimuli which have evoked the change. Malignant tumours may cause the death of the animal.

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