abnormal mass of tissue as a result of abnormal growth or division of cells
(Redirected from Tumor)

A neoplasm (or neoplasm) is tissue that is growing where it should not be. If they become a mass, they become a tumour. Tumours are either malignant (harmful) or benign (safe). Cancer, for example is malignant and sometimes spreads to other places on the body. Some tumours have a cause that makes them grow. For some tumours no cause is known.[1][2][3] A tumour usually forms as a lump or mass.[4]

Tasmanian devil with a tumour

The Tasmanian Devils in Tasmania, Australia are in danger of becoming extinct because of a malignant tumour that grows on their face.[5]


  1. Birbrair A, Zhang T, Wang ZM, Messi ML, Olson JD, Mintz A, Delbono O (Jul 2014). "Type-2 pericytes participate in normal and tumoral angiogenesis". American Journal of Physiology. Cell Physiology. 307 (1): C25-38. doi:10.1152/ajpcell.00084.2014. PMC 4080181. PMID 24788248.{{cite journal}}: CS1 maint: uses authors parameter (link)
  2. Cooper GM (1992). Elements of human cancer. Boston: Jones and Bartlett Publishers. p. 16. ISBN 978-0-86720-191-8.
  3. Taylor, Elizabeth J. (2000). Dorland's Illustrated medical dictionary (29th ed.). Philadelphia: Saunders. p. 1184. ISBN 0721662544.
  4. Stedman's medical dictionary (28th ed.). Philadelphia: Lippincott Williams & Wilkins. 2006. p. Neoplasm. ISBN 0781733901.
  5. Department of Primary Industry and Water. Tasmanian Devil Facial Tumour Disease