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MyPathologyReport Printed: August 25, 2026

What is a neoplasm?

A neoplasm is an abnormal growth of cells in your body. Normally, your body carefully controls how cells grow, divide, and die. In a neoplasm, this normal control is disrupted, causing cells to multiply excessively and form a lump or mass. The word “neoplasm” literally means “new growth.”

Does neoplasm mean cancer?

Not necessarily. While a neoplasm can be cancerous, it doesn’t always mean cancer.

Neoplasms are divided into two main categories:

Can a neoplasm be benign?

Yes. Many neoplasms are benign, meaning they are not cancerous. Benign neoplasms usually don’t pose serious health risks unless they grow very large, press on vital organs, or cause uncomfortable symptoms. Examples of benign neoplasms include moles on the skin, lipomas (fatty growths), uterine leiomyomas (fibroids), and certain types of polyps.

What causes a neoplasm?

The cause of a neoplasm depends on its type and location in the body. Many factors can lead to neoplasms, including genetic changes (such as mutations), environmental exposures (such as chemicals or radiation), infections (such as certain viruses), chronic inflammation, or hormonal imbalances. For instance:

In many cases, the exact cause of a neoplasm might remain unclear or unknown.

Do neoplasm and tumor mean the same thing?

Yes. Doctors often use the terms “neoplasm” and “tumor” interchangeably. Both describe an abnormal growth or mass of cells. However, “tumor” is used more commonly, especially when speaking with patients, whereas “neoplasm” is often used in medical or pathology reports.

What are the most common types of neoplasms?

Common examples of benign neoplasms include:

Common malignant (cancerous) neoplasms include:

Knowing the specific type of neoplasm helps doctors plan the most appropriate treatment and management strategies.