Nodule (medicine)

Nodule (medicine)

A nodule in medicine is a growth of abnormal tissue. Nodules can develop just below the skin. They can also develop in deeper skin tissues or internal organs.

Definition

The American Heritage Dictionary defines a nodule as a small knot, protuberance, or swelling. In medicine, a nodule is a solid, spherical, abnormal growth, or lump, of tissue that is present in or on the body. It is less than 2 cm (0.8 inches) in size. If the lesion is larger than 2 cm, it is referred to as a tumor.

Causes

Nodules can be caused by a variety of conditions, including infections, inflammation, tumors or neoplasms. The type of cells involved can also differ, ranging from epithelial cells to fat cells.

Diagnosis

The diagnosis of a nodule depends on the location of the nodule. For example, a nodule on the skin or under the skin can often be diagnosed by physical examination. However, a nodule in an internal organ usually requires imaging tests for diagnosis.

Treatment

The treatment of a nodule depends on the cause. Some nodules will resolve spontaneously and require no treatment. Others may require surgical removal or medical treatment.

See also

• Cyst
• Tumor
• Lesion

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