Benign - Definition and Examples - Biology Online Dictionary (original) (raw)

Benign
n., adjective
[bɪˈnaɪn]
Definition: Not aggressive or posing any serious threat especially to health

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How to define benign? The meaning of benign in a general sense is “beneficial” and “pleasant”. Benign is something that apparently describes something that does not cause harm or that is being “kind”. Conversely, the term “_malignant_” is the opposite of benign and it is used to describe things that aren’t pleasant or that intend to harm.

What does benign mean medically?

In oncology, the term “benign” is used to describe a condition or an outgrowth, such as a tumor, that is non-progressive (meaning it will not change or progress to an advanced state) and non-metastatic (meaning it does not spread). A benign tumor would therefore be one that is not dangerous and can be cured or treated. Benign conditions are not recurrent and harmless, as opposed to malignant tumors (or cancer).

Benign conditions are usually harmless and not serious or dangerous. Therefore, benign tumors are not cancerous. The opposite of benign is malignant. Malignant is a term used to describe harmful metastatic and cancerous tumors that spread disease all over the body.

For example, benign tumors are not usually harmful and tend to grow rather slowly and in one place. Malignant tumors, on the contrary, have a faster rate of growth and can grow new blood vessels (angiogenesis) and thus, the cancer cells can detach from the tumor and use the blood vessel to spread, eventually harming the affected tissues and nerves. Therefore, benign conditions may only result in local problems without causing systemic problems.

What is benign in biology?
Benign is a word used to describe something that is not essentially posing a danger to one’s health, such as a benign tumor. In medical definition, “_benign_” is used to describe noncancerous tumors or masses. A benign tumor does not spread to other areas in the body. A tumor that leaves its site and invades the surrounding tissue or distant body parts is not benign but cancerous (or malignant). See also: cancer

Can benign conditions be serious?

Benign conditions can be serious if they are near nerves or blood vessels. Benign tumors can produce pressure that decreases the blood flow to a certain area of the body causing ischemia and tissue death or even organ damage. These conditions may sometimes be serious and the benign tumor must be treated and removed.

What factors contribute to the formation of benign tumors?

The formation of tumors usually occurs without any reason. However, some factors may contribute to its formation such as:

benign vs malignant tumors - diagram

Figure 1: Benign tumor and malignant tumor (diagram). Image Source: Simon Caulton, CC BY-SA 3.0, modified by Maria Victoria Gonzaga of Biology Online.

Benign Examples

The most significant benign condition that occurs in humans is the development of benign tumors. Benign tumors remain in their primary location where they are formed. They do not move to other sites of the body to invade them. Benign tumors are usually formed slowly with visible outer borders of connective tissue and fibrous sheath whereas malignant tumors are less differentiated.

Benign tumors are not harmful; however, they may produce pressure on the surrounding tissue causing pain, discomfort, or other complications. For example, the formation of a benign tumor may produce pressure on the trachea causing breathing difficulties. Other benign tumors can be life-threatening such as brain tumors. Endocrine tumors are formed due to the abnormal production of some hormones. Examples of endocrine tumors are adrenocortical adenomas (benign tumors of the adrenal cortex with the abnormal production of the adrenal hormone, commonly due to overproduction) and thyroid adenomas (thyroid nodules).

After surgical removal, benign tumors do not usually form again but malignant tumors can sometimes grow again after removal. Radiation may be used to treat benign tumors which cannot be removed.

Some benign tumors may become malignant tumors over time. These tumors should be monitored and may be removed surgically to avoid the formation of a malignant tumor. For example, benign tumors in the colon usually become malignant so they are removed.

When a benign tumor becomes malignant (a depiction). Source: Maria Victoria Gonzaga of Biology Online.

Types of Benign Tumors

There are different types of benign tumors depending on their origin, the most common benign tumors are:

examples of benign tumors

Figure 2: Examples of benign tumors. Image Source: Maria Victoria Gonzaga of Biology Online.

What are Treatment Options for benign tumors?

These are the common management and/or treatments for benign tumors.

Choosing one of the treatment options for a tumor depends on several factors including the site of the tumor, symptoms including pain and discomfort, health condition of the patient, the prognosis of the tumor, and the impact of the tumor on surrounding tissue.

Surgery is the most convenient approach for removing benign tumors. Benign tumors are removed to stop or avoid their complications including seizures, pain, and cosmetic concerns. Sclerotherapy is another method for the treatment of benign tumors, this approach is usually used to treat rectal adenomas. Chemical treatment shrinks blood vessels so it is used to stop the blood supply to the tumor; thus, preventing its development. Chemotherapy and radiation are usually used to control intracranial benign tumors where surgery is life-threatening. Also, rectal hemangiomas are treated by radiation. Benign tumors of the skin are removed by surgery or other methods such as laser, chemical peel, dermabrasion, and topical medications.

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