← All explanationsRadicular cyst

What is a cyst at a tooth root?

A radicular cyst is an inflammatory, tissue-lined cavity near a tooth root. It is usually associated with a tooth whose pulp has died. Examination, X-rays and, when needed, examination of tissue help establish the diagnosis.

For dental trainees & teams

01 / 03

Inflammation around the root

A radicular cyst may develop from longstanding inflammation around a tooth with dead pulp. Smaller cysts may initially go unnoticed.

02 / 03

An X-ray is only part of the assessment

A dark area at the root tip does not by itself prove a cyst. Other inflammatory changes can look similar. Clinical findings and, when needed, tissue are assessed together.

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Treatment needs follow-up

Root canal treatment or surgical measures may be appropriate, depending on the tooth and findings. Follow-up checks show whether the change is resolving.

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At a glance

What is a radicular cyst?

An inflammatory cavity with a tissue lining near a tooth root.

How is it identified?

By examination and imaging; tissue examination is sometimes needed.

How is it treated?

Individually, treating the causative tooth and using surgery when needed, with follow-up.

Knowledge in motion

Explained in 36 seconds.

Three steps. Straight to the point.
Explanations are also shown on screen.

Short film (German): What is a cyst at a tooth root?

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Silent film in German · English explanations in the three views above

Often confused

Cyst or apical radiolucency?

Radiolucency first describes an X-ray appearance. A cyst is a diagnosis; a similar-looking area may have other causes.

Quick answers

Is a cyst the same as an abscess?

No. An abscess is a collection of pus. A cyst has a tissue-lined cavity and may also become infected.

Does the tooth have to be removed?

Not automatically. The ability to preserve the tooth, and the size and nature of the lesion, determine the treatment approach.

When is prompt assessment important?

Increasing swelling, pain or fever needs prompt dental assessment. Breathing difficulty or marked swallowing problems require immediate emergency medical help.

At the practice

For your consultation

A question to discuss with Dr. med. dent. Niusha Barahmand Pour:

What is already known about the change at my tooth root, and what further examination is needed?

Symptoms, examination findings and personal wishes form the basis of individual treatment planning.

A finding at the root tip should be assessed together with the affected tooth.

Discuss a root-tip findingChoose an appointment on Doctolib

Meet Dr. med. dent. Niusha Barahmand Pour

Learning for dental trainees & teamsUnderstand clinical terms and build your knowledge

Build on the simple explanation with clinical terms, key distinctions and a knowledge question.

Radicular: Relating to a tooth root.
Epithelium: The cell layer lining the cavity in this type of cyst.
Apical radiolucency: An area of lower X-ray density at the root tip; not a final tissue diagnosis.

Know the difference

A radicular cyst is inflammatory and associated with pulp necrosis. Its X-ray shape alone cannot reliably distinguish it from a periapical granuloma.

Knowledge questionWhich statement about apical radiolucency is correct?

This question supports learning. It does not assess personal symptoms.

Every round radiolucency is definitely a radicular cyst.
A radiolucency rules out inflammation.
Clinical findings and, when needed, histology clarify its cause.

Show answer and explanation

Clinical findings and, when needed, histology clarify its cause.

Different lesions can look similar. The outline alone cannot reliably establish the tissue diagnosis.

Sources for further learning

Sources and context

Editorial research: 23 October 2026. This explanation covers general principles and does not replace a personal examination. Suitable treatment is discussed following individual assessment.