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Chest & Lung Biopsy

Mediastinal Mass Biopsy — How the Sample Is Taken

A mass in the mediastinum — the space at the centre of your chest — needs a tissue sample before any treatment can begin. How it is reached, and what the biopsy is likely to show, depends on where the mass sits on the scan.

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

  • Where it sits decides the route — Front-of-chest masses are reached by CT-guided needle; airway-adjacent nodes by a camera through the windpipe.
  • A core, not an aspirate — Lymphoma and thymoma require a tissue cylinder to be classified. A fine-needle aspirate is usually not enough.
  • TB is always tested for — Mediastinal lymph node enlargement from TB is common in India. TB testing runs alongside histopathology on every sample.
  • Results come in stages — Histopathology returns within days; immunohistochemistry and TB culture take longer. Your team shares results as they arrive.
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A mediastinal mass biopsy takes a tissue sample from the space between your lungs. Most masses are reached by a CT-guided needle through the chest wall, or by an ultrasound camera passed through the airway. The sample is tested for lymphoma, thymoma, germ cell tumours, and in India always for tuberculosis as well.

How is a mediastinal mass reached for biopsy?

The route depends on where the mass sits. Most masses in the anterior mediastinum — the front of the chest — are biopsied by a core needle guided by CT scan. Local anaesthetic numbs the skin; you lie still while the needle passes through the chest wall to take a small cylinder of tissue.

Lymph nodes in the middle mediastinum, near the airway, are usually sampled using EBUS — a flexible camera passed through your mouth into the windpipe. A needle is guided through the airway wall under real-time ultrasound. No cut is made in the skin.

When neither approach can safely reach the mass, a surgical method such as mediastinoscopy is used under general anaesthetic through a small incision at the base of the neck.

Terms you will hear

Anterior mediastinum
The front portion of the chest, between the breastbone and the front of the heart. Lymphoma, thymoma, and germ cell tumours arise here most often.
Core needle biopsy
A thick needle that removes a small cylinder of tissue, keeping the cell architecture intact — what the laboratory needs to classify lymphoma and other tumours correctly.
FNA (fine needle aspiration)
A thin needle that draws out individual cells. Usually not enough on its own for a mediastinal mass, because it does not preserve the tissue structure needed for subtype classification.
EBUS (endobronchial ultrasound)
A flexible camera passed through the mouth into the windpipe. An ultrasound probe on its tip locates nearby lymph nodes, and a needle samples them through the airway wall without cutting the skin.
Mediastinoscopy
A surgical procedure under general anaesthetic. A thin camera is inserted through a small incision at the base of the neck to view and biopsy masses in the upper mediastinum.

What does a mediastinal biopsy usually find?

In younger adults, the most common diagnoses in India are Hodgkin lymphoma, non-Hodgkin lymphoma, germ cell tumours, and thymoma — arising most often in the anterior mediastinum.

Tuberculosis causes mediastinal lymph node enlargement far more commonly in India than in most countries, and it can look identical to lymphoma on a scan. Every biopsy is sent for TB culture and GeneXpert PCR alongside histopathology — even when the scan appearance strongly suggests lymphoma.

If the first sample does not yield enough tissue for a diagnosis, a repeat biopsy or a surgically obtained sample may be needed before treatment begins. This is the correct next step, not a failure.

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What to expect on the day of a CT-guided biopsy

  • FastingYou will be asked not to eat or drink for a set period beforehand. Confirm the exact time with your team when the date is booked.
  • Medicines to pauseSome blood-thinning medicines are stopped before the procedure. Tell your team everything you take, including herbal preparations and supplements.
  • Awake with local anaestheticYou remain awake throughout. The skin is numbed; you will feel pressure at the site but not sharp pain.
  • Chest X-ray before dischargeA chest X-ray is taken after the procedure to check for pneumothorax. You will not leave until the team has reviewed it.
  • Bring someone with youArrange for someone to travel home with you. Most patients are observed for a few hours and discharged the same day.

Risks — what the consent form covers

Pneumothorax (air leak into the chest)

Air entering the space around the lung when the needle crosses the chest wall is the most common complication. In a proportion of patients it is small and reabsorbs without any treatment. A minority develop a larger pneumothorax that needs a drain placed the same day and a short admission. A chest X-ray is done before discharge specifically to detect this. EBUS does not carry this risk because the needle does not cross the chest wall.

Bleeding

A small amount of bleeding at the needle site usually stops on its own. Significant bleeding needing intervention is uncommon. Clotting tests are done in advance and blood-thinning medicines are paused for this reason. Tell your team before the procedure if you take aspirin, warfarin, or any antiplatelet or anticoagulant medicine, including those prescribed by another doctor.

Inadequate sample

The needle may not retrieve enough tissue for a complete diagnosis, particularly if the mass contains areas of dead tissue or dense scarring. If this happens, a repeat biopsy using a larger needle or a surgical approach will be planned. Your oncologist will explain the next step clearly if the first sample is not sufficient.

Infection

Any needle through the skin carries a small infection risk. Watch for fever, increasing pain at the biopsy site, or worsening breathlessness in the days after the procedure. Report any of these to your team the same day rather than waiting for your next scheduled visit.

Post-procedure pain

A dull ache at the site is normal for a day or two, and most people manage it with simple pain relief. Sharp, worsening chest pain alongside breathlessness is different — it needs immediate attention. Go to hospital or call your team that day; do not wait.

Did you know?

Hodgkin lymphoma — one of the most common causes of a mediastinal mass in young adults — has among the highest response rates of any cancer when the subtype is correctly identified and treatment begins on the right regimen.

The subtype can only be determined from tissue, not from a scan. The biopsy is what makes the treatment decision possible.

Source: ESMO Clinical Practice Guidelines: Hodgkin Lymphoma

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Common questions

Frequently asked questions

Why does the doctor need a core biopsy and not just a fine needle aspirate?

A fine needle aspirate collects individual cells but cannot show how they are arranged within the tissue. Lymphoma must be classified into subtypes before treatment begins, and that classification depends on tissue architecture — something only a core biopsy preserves. Starting the wrong regimen is not a neutral outcome, and getting adequate tissue the first time reduces that risk.

Can the CT or PET scan tell us what the mass is?

A scan describes the size, position, and metabolic activity of a mass and suggests which diagnoses are most likely — but it cannot confirm a cancer diagnosis or identify the cell type. Two masses that look identical on imaging can require completely different treatments. A tissue sample is always required before any treatment begins.

How long do the biopsy results take?

Histopathology usually returns within several days to a week. Immunohistochemistry — additional staining that distinguishes lymphoma subtypes and other tumour types — takes longer and may add several more days. TB culture can take several weeks, though GeneXpert PCR gives a faster preliminary result for TB. Your team will usually share each report as it arrives rather than asking you to wait for everything at once.

What happens if the needle does not get enough tissue?

A repeat biopsy will be planned — using a larger needle, a different route, or a surgical approach. This happens in a proportion of cases, most often when the mass contains necrosis or dense scarring, and it adds time that is understandably difficult. It does not mean the situation is more dangerous. It means the team needs reliable tissue to make the right decision.

What if the result shows TB rather than cancer?

TB lymphadenopathy in the mediastinum is treated with a course of standard anti-TB medicines over several months, and most people respond well. If the tissue shows both TB and features that raise concern about a tumour alongside it, your oncologist and a TB specialist will review together before a plan is made. This is why TB testing runs on every mediastinal biopsy at CION, even when the scan looks more like lymphoma.

Can a biopsy cause the cancer to spread?

The evidence from decades of oncology practice does not support the idea that a needle biopsy causes cancer to spread. ASCO and ESMO guidelines treat biopsy as a safe and necessary step before treatment. Beginning treatment without knowing the diagnosis — and potentially treating the wrong disease — carries far greater risk than the biopsy itself.

Full index

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