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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 ?
But when it comes to tracking cancer treatments they do essentially the same thing: produce innerbody images that doctors can use to follow the size of tumors.
But assessing the true effect of a chemical is not simply a matter of counting tumors; a statistician's knowledge of background tumor rates and confounding variables provides a key perspective in this interpretive process.
Two weeks later, tumors had disappeared in 38 percent of the mice and had shrunk by more than half in an additional 24 percent.
The results indicate that tumors completely regressed within the first four weeks of treatment and that no additional growth was observed after cessation of therapy.
The incidence of testicular tumors in the United States is approximately 6 per 100,000 males; these neoplasms are the most common tumors in males in the 15-to-34-year age group.
According to the American Brain Tumor Association, 180,000 people will be diagnosed with brain tumors in 2001.
Tumors depend on the growth of new blood vessels (a process called "angiogenesis") to support their continued growth.
Most of these tumors are locally aggressive, and by the time patients seek treatment, most of the tumors have metastasized to the cervical lymph nodes.
The answer, according to Folkman and others involved in angiogenesis research, is that while those substances may suppress the growth of tumors in some, or even many, individuals, their natural levels are not sufficient to prevent tumor growth in patients who develop malignant cancers.
Researchers will soon begin human testing on a type of drug that has drastically shrunk and even eradicated cancerous tumors (a mass of cells) in mice--and left them cancer-free.
The gastrin comes from one or more tumors in the pancreas and small intestine.
The removal of tumors attached to hearing, balance or facial nerves can make the patient's symptoms worse because sections of these nerves must also be removed with the tumor.