Keratosis Without Dysplasia of the Larynx: Understanding Your Pathology Report

Section Editor: Jason Wasserman MD PhD FRCPC
July 27, 2026

Keratosis without dysplasia of the larynx means the lining of the voice box has built up an unusually thick layer of keratin, a tough protective protein, but the cells themselves look normal. It is most often found on the vocal cords, though it can occur anywhere in the larynx.

The second half of the name is the important part. “Without dysplasia” means the pathologist looked carefully at the cells and did not find the precancerous changes that would make this a more concerning diagnosis. This is a benign (non-cancerous) finding and it is not precancerous.

That said, this diagnosis is not simply dismissed. The thickened keratin is a sign that the lining of the larynx has been irritated over a long period, usually by the same things that cause laryngeal cancer. The risk of a cancer developing is low, but it is not zero, which is why the area is usually kept under observation and the underlying irritation addressed.

This article explains the findings you are likely to see on a pathology report for keratosis without dysplasia of the larynx, what each one means, and why it matters for your care.

What causes keratosis without dysplasia of the larynx?

Keratosis without dysplasia develops when the lining of the larynx is irritated repeatedly over a long period. The lining responds to ongoing irritation by producing extra keratin as a protective layer, in much the same way skin thickens where it is repeatedly rubbed. The most common causes are:

Tobacco. The most common cause by a wide margin.
Alcohol. Heavy use irritates the lining and adds to the effect of smoking.
Acid reflux. Stomach acid reaching the throat irritates the lining of the larynx.
Workplace and environmental irritants. Long-term exposure to dusts, fumes, or pollutants.
Voice overuse or strain. Repeated mechanical irritation of the vocal cords can contribute.

These are the same exposures that cause dysplasia and cancer of the larynx, which is why the finding is taken as a signal to address them even though the change itself is benign.

What are the symptoms of keratosis without dysplasia of the larynx?

Because keratosis usually forms on the vocal cords, the most common symptom is a change in the voice, since a thickened area interferes with the way the cord vibrates. Symptoms may include:

Hoarseness, often the only symptom
A rough or strained voice quality
A sensation of something in the throat, or frequent throat clearing
A persistent cough
Difficulty swallowing, which is less common

Some people have no symptoms at all, and the change is found during an examination performed for another reason. When a specialist examines the larynx, keratosis usually appears as a white patch, which is why it is often biopsied: the appearance alone cannot distinguish harmless keratosis from dysplasia or an early cancer.

How is the diagnosis made?

The diagnosis is made when a pathologist examines tissue from the abnormal area under the microscope. The tissue is obtained by biopsy during a procedure called microlaryngoscopy, in which a thin scope is passed through the mouth under general anesthetic so the surgeon can see the vocal cords directly and remove the abnormal area or take a sample from it.

Under the microscope, the pathologist sees a thickened layer of keratin on the surface of the lining. The critical step is examining the squamous cells beneath that layer and confirming that they are maturing normally and show no atypia, meaning they do not look abnormal in size, shape, or appearance. It is the absence of these changes that makes this keratosis without dysplasia rather than a precancerous diagnosis.

Your report may describe the findings using several related terms. They describe what the pathologist saw and none of them means cancer:

Hyperkeratosis. A thickened layer of keratin on the surface. This is what makes the area look white.
Parakeratosis. Keratin that still contains the remains of cell nuclei, which normally would have been shed.
Acanthosis. Thickening of the lining itself, beneath the keratin layer.
Inflammation. Immune cells in the tissue below, reflecting the ongoing irritation.

One limitation of a biopsy is worth understanding, because it explains why follow-up is recommended even after a reassuring result. A biopsy samples only part of the abnormal area, and dysplasia can be patchy. A result showing keratosis without dysplasia establishes what was present in the tissue examined, and does not completely rule out a more abnormal area elsewhere in the same patch. This is one reason your specialist may want to re-examine the larynx rather than consider the matter closed.

What is the risk that keratosis without dysplasia will turn into cancer?

Keratosis without dysplasia of the larynx carries a low risk of developing into cancer, and most people with this diagnosis never do. Published studies generally report progression to cancer in fewer than 5% of cases, though some series report higher figures. The risk is clearly lower than for dysplasia, where the abnormal cells themselves indicate a change already underway.

Two things influence what happens next. The first is whether the irritation continues. Keratosis develops in response to ongoing irritation, so continuing to smoke keeps the process going, while stopping removes the cause and some areas of keratosis improve or resolve. The second is the sampling limitation described above, which is why the area is usually watched rather than considered settled after a single biopsy.

If keratosis does progress, it generally does so gradually, first developing into keratinizing squamous dysplasia, a precancerous change, before any cancer develops. This gradual sequence is what makes regular examination worthwhile, because a change can be identified and treated well before it becomes cancer.

What happens after the diagnosis?

Keratosis without dysplasia does not usually require treatment beyond removal of the abnormal area, which has often already happened at the time of the diagnostic procedure. What matters most afterward is addressing the irritation that caused it and keeping the area under observation.

Stopping smoking is the single most effective step, and it is worth asking your care team for support with quitting. Reducing alcohol, treating acid reflux, and limiting exposure to workplace irritants all help. If voice strain has contributed, voice therapy with a speech-language pathologist may be recommended.

Your specialist will usually arrange follow-up examinations of the larynx. How often and for how long depends on your risk factors and whether the abnormal area was completely removed, but follow-up generally continues for years rather than ending after a single visit. If the area returns, enlarges, or changes in appearance, another biopsy may be recommended.

Questions to ask your doctor

Did the biopsy show any dysplasia or cancer?
Where in my larynx is the abnormal area, and how much is involved?
Was the whole area removed, or was only a sample taken?
Given that a biopsy samples only part of the area, do I need another look?
What is my risk of this becoming a precancerous change or cancer?
How often will my larynx be examined, and for how long?
What help is available to me for stopping smoking or reducing alcohol?
Should my acid reflux be treated?
Would voice therapy help me?
What changes should prompt me to call before my next visit?