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Queen's English for tumor, see there.


1. Any swelling or tumefaction.
2. Synonym(s): neoplasm, tumour.
3. One of the four signs of inflammation (tumor, calor, dolor, rubor) enunciated by Celsus.
Synonym(s): tumour.
[L. tumor, a swelling]


A swelling. The term usually refers to any mass of cells resulting from abnormal degree of multiplication. Tumours may be BENIGN or MALIGNANT. Benign tumours enlarge locally, and are often enclosed in capsules, but do not invade tissue or spread remotely. Malignant tumours infiltrate locally and also seed off into lymphatic vessels and the bloodstream to establish secondary growths (metastases) elsewhere in the body.


a swelling, usually a morbid growth.


  • benign tumour non-invasive, encapsulated tumour; does not form metastases nor destroy local tissues; its bulk may distort surrounding tissues

  • bone tumour see Table 1

  • Ewing's tumour see Ewing's sarcoma

  • malignant tumour invasive tumour, usually non-encapsulated; forms metastases, destroys local tissues, tends to recur after excision and has a high mortality rate, unless treated aggressively

Table 1: Tumours arising in bone
Bone tumour typeExamples occurring in lower limb/foot
BenignAneurysmal bone cyst
Solitary osteochondroma
Simple/solitary bone cyst
Osteoid osteoma
Giant-cell tumour
Ewing's sarcoma
Osteogenic sarcoma


(tū'mŏr) Avoid the jargonistic use of this word as a synonym of neoplasm.
1. Any swelling or tumefaction.
2. One of the four signs of inflammation (the others are, calor, dolor, rubor) enunciated by Celsus.
Synonym(s): tumour.
[L. tumor, a swelling]

Patient discussion about tumour

Q. What is a brain tumor?

A. A brain tumour is any intracranial tumor normally either in the brain itself in the cranial nerves, in the brain envelopes, skull, pituitary and pineal gland, or spread from cancers primarily located in other organs (metastatic tumors). It is created by abnormal and uncontrolled cell division. Primary (true) brain tumors (which start in the brain) are commonly located in the posterior cranial fossa in children and in the anterior two-thirds of the cerebral hemispheres in adults, although they can affect any part of the brain.

Q. Is this a tumor? I felt a lump in my breast a few days ago in the shower. Is this a Tumor? Help! I'm scared.

A. If you felt a lump in your breast then you should go see your Doctor to check whether or not it is something that could be dangerous.

Q. what is carcinoid tumors? I had my appendix removed and the doctor came in the room very shocked and said it was full of carcinoid tumors. Im scared to get them somewhere else.

A. ya I have pain all the time but the doctors wont give me anything cuz im so young they don't want me hooked on anything. thank you sooo much for being so kind.

More discussions about tumour
References in periodicals archive ?
Nonepithelial tumors of the nasal cavity, paranasal sinuses and nasopharynx.
In the other scenario, only a few select cells from a tumor have the capacity to initiate new, full-fledged tumors.
The reduced body weights in these long-term studies may have been contributory to the lowered tumor rates (8-10), as most of the reductions in tumor incidences occurred in hormone-controlled organs (11).
It had spread to a cluster of lymph nodes where tumors normally do not appear.
Occasionally, a person who has FMEN1 develops tumors of the pancreas that secrete high levels of pancreatic hormones other than gastrin.
Further, approximately 10 to 15 % of carotid body tumors recur.
In people with lymphoma, for example, changes in blood flow through tumors were evident a week after chemotherapy and preceded changes in tumor size discernable by conventional CT, says Wolfgang Romer of the University of Erlangen-Nuremberg in Germany.
Understanding what causes these changes can lead researchers to take measures to reduce the incidence of background tumors and improve the health of the animals as well as the accuracy of the tests.
Judah Folkman, whose research into blood vessels that feed tumors formed a foundation for the discovery: ``This is very promising and very elegant work.
Although inhibiting VEGF activity with Avastin reduces tumor angiogenesis and growth, it does not eradicate tumors.
Our discussion of this case focuses on the evaluation and management of germ cell tumors with cervical metastases.
According to the American Brain Tumor Association, 180,000 people will be diagnosed with brain tumors in 2001.