Atrophy: Definition

Atrophy (also described as atrophic) means the shrinking or loss of tissue in an organ or body part. It describes how tissue appears under the microscope rather than providing a specific diagnosis. Atrophy itself is a benign (noncancerous) change. What it means for you depends on which tissue is affected and what is causing it. This article explains what atrophy is, what causes it, and why it may appear in your pathology report.

What causes atrophy?

Tissue can become atrophic for several reasons, including:

• Decreased blood supply — Every organ and tissue needs blood to stay healthy. If blood flow to an organ is reduced for a long time, the organ may shrink to adapt. For example, tissue around a large tumor can become atrophic because pressure from the tumor reduces blood flow.
• Disuse — When tissues are not used regularly, they can shrink or weaken over time. This often happens with muscles that are not exercised after an injury, resulting in visible muscle atrophy even without a microscope.
• Decreased hormone stimulation — Hormones help keep certain organs healthy and working. As hormone levels naturally decline with age, tissues that depend on them, such as the breast or the endometrium (the lining of the uterus), may become smaller and atrophic.
• Chronic inflammation — Long-lasting inflammation can damage tissue over time, causing it to shrink or lose cells. An example is atrophic gastritis, in which ongoing inflammation of the stomach lining leads to atrophy.

Where is atrophy commonly seen in the body?

Atrophy can occur almost anywhere in the body, but it is commonly seen in:

• Muscles, particularly after periods of inactivity.
• Breast tissue and the lining of the uterus (endometrium), especially after menopause.
• Brain tissue in older adults.
• Organs or tissues affected by decreased blood flow.
• The stomach, especially in conditions such as atrophic gastritis.

What are the symptoms of atrophy?

The symptoms of atrophy depend on the organ or tissue involved:

• Muscle atrophy may cause weakness or visible muscle shrinkage.
• Atrophy of the breast or reproductive tissues usually causes no symptoms but may lead to noticeable physical changes.
• Brain atrophy may be associated with memory problems or changes in thinking.
• Stomach atrophy, such as in atrophic gastritis, may cause digestive symptoms or vitamin deficiencies.

In many cases, especially with internal organs, atrophy causes no symptoms and may only be noticed during a medical examination or an imaging test.

What does atrophy look like under the microscope?

Under the microscope, atrophic tissue looks thinner or smaller than normal. The individual cells may appear smaller, and the spaces between them may be more noticeable. These changes reflect how the cells have adapted to reduced use, decreased blood supply, lower hormone stimulation, or chronic inflammation.

Questions to ask your doctor

• What does atrophy mean in my pathology report?
• Which tissue or organ is affected by atrophy in my case?
• What is causing the atrophy?
• Is the atrophy related to aging, hormone changes, reduced blood flow, or inflammation?
• Does the underlying cause need to be monitored or treated?
• Could this atrophy lead to any complications, such as muscle weakness or vitamin deficiencies?
• Will this finding be followed up over time?

Related articles on MyPathologyReport.com

• Hypertrophy (when cells grow larger rather than shrinking)
• Hyperplasia (when the number of cells increases)
• Metaplasia (when one normal cell type is replaced by another)
• Chronic inflammation (a common cause of tissue atrophy)
• Chronic atrophic gastritis (atrophy of the stomach lining)