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Pleural and chest wall biopsy

Thoracoscopy and — Pleural Biopsy

If fluid has been building up around your lung and initial tests have not explained why, your doctor may recommend a thoracoscopy — a short procedure that passes a thin camera through a small cut in the chest wall to look directly at the pleural lining and take tissue samples.

Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026

  • A camera, not just a needle — Thoracoscopy lets your doctor see the pleural surface directly and take tissue from areas that look abnormal.
  • Used when fluid tests fall short — It is recommended when cytology of pleural fluid has not given a clear answer after one or two attempts.
  • Essential for mesothelioma diagnosis — Mesothelioma needs larger tissue samples than a needle through the skin can reliably provide, which is why thoracoscopy is recommended early when it is suspected.
  • A short stay, not a long operation — Most people are home within one to two days.
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Thoracoscopy is a procedure where a thin camera is passed into the pleural space — the gap between your lung and chest wall — to view the lining and take tissue samples. Your doctor recommends it when fluid tests have not given a clear answer, or when mesothelioma is suspected.

When does your doctor recommend a thoracoscopic pleural biopsy?

The most common reason is a pleural effusion — fluid that has built up around the lung — that simpler tests have not explained. Your doctor will usually have tested the fluid first. If the cells came back unclear, or the effusion keeps returning, thoracoscopy is the next step.

It is also recommended early when mesothelioma is suspected. Mesothelioma is a cancer of the pleural lining, and diagnosing it needs larger tissue samples than a fluid test or a skin needle can reliably provide. Cancer from another part of the body that has spread to the pleura is another reason this procedure may be suggested.

What should you tell your team before the procedure?

  • List all medicines you take — especially blood thinners such as aspirin, warfarin, clopidogrel, or newer anticoagulants
  • Tell them about any supplements, herbal medicines, or ayurvedic preparations you are currently using
  • Mention any previous surgery or other procedures on the same side of the chest
  • Tell them if you have a pacemaker or any other implanted cardiac device
  • Tell them about any allergies, particularly to local anaesthetic agents or latex

What do the medical terms used for this procedure mean?

Pleura
The thin two-layered membrane that wraps around each lung and lines the inside of the chest wall.
Pleural space
The narrow gap between the two pleural layers, which normally contains only a small amount of fluid.
Pleural effusion
A build-up of excess fluid in the pleural space that can compress the lung and cause breathlessness.
Thoracoscope
The thin camera instrument passed through the chest wall into the pleural space to allow direct viewing of the lining.
Pleurodesis
A procedure sometimes performed at the same sitting, which seals the pleural layers together to prevent fluid from accumulating again.

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How is the pleural lining actually sampled?

A small cut — usually one to two centimetres — is made between the ribs on the side of the effusion. A thin tube is placed through this cut to create a channel into the pleural space, and the thoracoscope is passed through it. Your doctor can see the pleural surface on a screen and identify areas that look abnormal.

Small biopsy forceps are passed through the same or a second tiny opening to take several pieces of tissue from those areas. Any fluid in the pleural space is drained out at the same time, which improves the view and can bring relief if the fluid has been causing breathlessness.

What happens on the day of your thoracoscopy?

  1. Arrival and preparation

    Your team checks your observations and confirms which medicines you have stopped. A small intravenous line is placed in your arm.

  2. Positioning

    You lie on your side with the affected lung uppermost. The skin over the entry point is cleaned and a sterile drape placed around it.

  3. Sedation

    Medicine is given through the intravenous line to keep you comfortable and drowsy. Your team monitors you throughout. The type and amount of sedation or anaesthesia is decided by your doctor and anaesthetist based on your situation.

  4. Entry and inspection

    A small cut is made between two ribs, the thoracoscope is inserted, and your doctor examines the pleural surface on a screen.

  5. Biopsy and fluid drainage

    Several tissue samples are taken from areas that look abnormal. Fluid in the pleural space is drained out.

  6. Drain and closure

    A temporary chest drain is left in place to allow the lung to re-expand overnight. The skin is closed around it. The drain is removed the following day after a chest X-ray confirms the lung has come back up normally.

Did you know?

Medical thoracoscopy achieves a tissue diagnosis in a large majority of cases where pleural fluid sampling alone has not given a result.

For suspected mesothelioma, it is the investigation most likely to yield enough tissue for the molecular analysis that guides treatment planning.

Source: British Thoracic Society Guidelines for the Investigation of a Unilateral Pleural Effusion in Adults

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Common questions

Frequently asked questions

Is thoracoscopy the same as keyhole lung surgery?

Medical thoracoscopy and VATS — video-assisted thoracoscopic surgery — both use a camera through the chest wall, but they are different procedures. Medical thoracoscopy is usually done under sedation, uses one or two small openings, and is focused on examination and biopsy. VATS is a surgical procedure under general anaesthesia used for more complex chest operations. Which approach is planned for you depends on your clinical situation, and your team will explain the reason before the procedure.

Will I be awake during the procedure?

Most people having medical thoracoscopy are given sedation — medicine that makes you relaxed and drowsy — rather than a full general anaesthetic. You will not feel pain, though you may be aware of pressure at times. Some centres use general anaesthesia depending on what is planned or your specific health conditions. Your team will tell you exactly what is planned before the day, and will answer any concerns you have about sedation or anaesthesia.

How long will I be in hospital?

The procedure itself usually takes less than an hour, but a chest drain is left in place afterwards so the lung can re-expand, and this means at least one overnight stay. The drain is removed the following day if a chest X-ray shows the lung has come up normally. Most people go home within one to two days if there are no complications. Arrange for someone to collect you and stay with you at home for the first night after discharge.

When will the biopsy results come back?

Tissue samples go to a pathology laboratory and results typically take one to two weeks. For suspected mesothelioma, additional molecular testing is often needed and may take a little longer. Ask your team before discharge what the expected timeline is and how you will be contacted with the result. Some results are better discussed face-to-face — ask whether an appointment will be needed so you can plan for it.

Will the procedure cause a collapsed lung?

Some air entering the pleural space during the procedure is expected and is part of how the technique works — it creates the room needed for the camera. The chest drain left in afterwards allows this air to escape and the lung to come back up. A chest X-ray the following day confirms the lung has re-expanded before the drain is removed. Occasionally a small air leak persists and delays discharge by a day or two, and your team will tell you if this is happening.

What if the biopsy result is not conclusive?

A proportion of thoracoscopic biopsies come back without a clear diagnosis, even when the procedure went well. If this happens, your oncologist will discuss what to do next — this may include a surgical biopsy under general anaesthesia to obtain a larger sample, or a repeat procedure if the clinical picture has changed. A non-conclusive result does not mean nothing is wrong. It means more information is needed before a precise diagnosis and treatment plan can be made.

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