What Does Hyperplasia Mean on a Pathology Report?

NCI gives a two-part definition, and most people only hear the first part.

Hyperplasia means more cells than usual in an organ or tissue, and those cells look normal under a microscope. NCI then says it plainly: they are not cancer.

One more line follows: they are not cancer, but may become cancer. Both halves are true, and neither is a forecast about you.

On its own the word says very little. It counts cells; it does not judge them.

What gives it meaning is what sits beside it:

• the organ. Prostate, breast, womb lining and thyroid all differ.
• the word atypical, or the absence of it.
• a pattern name, such as ductal, lobular, simple or complex.
• any advice at the end of the report.

Find those words first, then read the sentence again.

NCI has a separate entry for atypical hyperplasia. It is a benign condition. The cells look abnormal under a microscope, and they are increased in number.

Read that slowly. It is still called benign, but two things are now true instead of one, and the odd appearance is the new part.

That is why one report leads to a note in your file, and another leads to a plan. Often the only difference is that one word.

This is the most common form there is, and the clearest example of the word not meaning danger.

NCI describes a prostate that is larger than normal, pressing on the bladder and the urethra. That can mean urgency, waking at night, trouble passing urine, or leaking.

Then NCI says the line worth reading twice. Benign prostatic hyperplasia does not increase a person's risk of prostate cancer.

It still needs care for other reasons. NCI says that if it is not treated, it can lead to a weak bladder, held urine, urine infections, bladder stones, or damage to the bladder or kidneys.

Here the name does the work. NCI describes an abnormal overgrowth of the lining of the uterus.

It lists four types: simple, complex, simple with atypia, and complex with atypia.

NCI says they differ in two ways: how abnormal the cells are, and how likely the condition is to become cancer.

So the plain phrase is an incomplete answer. The type is the answer, so ask which one you have.

NCI puts two breast findings in a group called precancerous conditions: atypical ductal hyperplasia and atypical lobular hyperplasia.

NCI defines a precancerous condition as one that is not cancer but may become cancer. A diagnosis means a higher risk of breast cancer later.

For both of these, NCI says the finding may increase your risk. It says a doctor may then suggest more frequent exams or scans. It may also lead to a talk about hormone therapy to lower risk.

Notice what that is. It is a risk plan, not a cancer diagnosis.

Where the report does not say atypical, often nothing changes at all.

Where it does, expect one of three paths: closer follow-up, a medicine aimed at the hormone driving it, or a small procedure to take the area out. Which one depends on the organ and on your history.

Precancerous Conditions covers that category. What Does Dysplasia Mean? covers the neighbouring word, which is about cells that look wrong rather than cells that are simply too many.

• NCI Dictionary of Cancer Terms — hyperplasia
• NCI Dictionary of Cancer Terms — atypical hyperplasia
• NCI Dictionary of Cancer Terms — endometrial hyperplasia
• NCI Dictionary of Cancer Terms — benign prostatic hyperplasia
• National Cancer Institute — Breast Changes and Conditions