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Biopsy procedures

What Is a — Wedge Biopsy?

If your biopsy report or consent form uses the word 'wedge', it means a triangular piece of tissue was removed surgically — not sampled through a needle. This page explains what that means, where it is used, and how it differs from the core needle biopsy most people are more familiar with.

Medically reviewed by Dr. Muralidhar Muddusetty, Surgical Oncologist, MBBS (AIIMS) · MS Surgery (AIIMS) · DNB Surg Onc · MRCS (Edinburgh) · Last reviewed September 2026

  • A piece, not a needle sample — A wedge biopsy cuts out a triangular segment of tissue rather than extracting a thin core through the skin.
  • Requires anaesthesia — It is a surgical procedure done in an operating theatre, not a clinic room procedure under local anaesthesia.
  • Liver and lung most often — These are the two organs most commonly sampled this way in cancer care, often during keyhole surgery.
  • Can be diagnostic and therapeutic — For some lung nodules, a wedge resection removes the lesion completely and gives a diagnosis at the same time.
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A wedge biopsy is a surgical procedure that removes a triangular piece of tissue from an organ — most often the liver or lung. Unlike a needle biopsy, it requires a small incision or keyhole surgery under anaesthesia. Your surgeon chooses it when a larger or more complete tissue sample is needed to make a diagnosis.

How is a wedge biopsy different from a core needle biopsy?

FeatureWedge biopsyCore needle biopsy
How tissue is removedA surgeon cuts a triangular wedge from the organ surfaceA hollow needle extracts a thin cylinder through the skin
Sample sizeLarger — covers more surface area and depthSmaller — a narrow core of tissue
AnaesthesiaGeneral or regional anaesthesiaUsually local anaesthesia only
Incision or punctureSurgical incision or keyhole portSmall skin puncture, often no stitches
Common organsLiver, lung, lymph node during open or keyhole surgeryLiver, breast, kidney, lymph node through the skin
Where it is doneOperating theatreRadiology suite or clinic room
RecoveryDays to a few weeks depending on approachSame day for most patients

What does a wedge biopsy actually remove?

A wedge biopsy takes a triangular or V-shaped slice from the surface or edge of an organ. The shape gives the pathologist a wide face on the outside that tapers inward, so they can examine both the surface layer and the tissue below it.

For the liver, this matters because many conditions — including cirrhosis and some tumours — affect the architecture of the tissue across a wide area, not just at one spot. A wedge gives the pathologist enough material to assess that structure.

For the lung, a surgeon uses a stapling device to remove the V-shaped segment of the outer lung and seal the cut edge in the same step. This is usually done through two or three small keyhole ports rather than a large chest incision.

Which organs are sampled with a wedge biopsy?

The liver and lung are the organs most commonly sampled by wedge biopsy in cancer care. A liver wedge is taken when a suspicious lesion sits near the surface, or when the surgeon needs to assess the liver's overall architecture rather than one isolated point.

In the lung, a wedge resection is a standard way to remove and diagnose a small peripheral nodule. If the lesion turns out to be a small early cancer, the wedge can serve as both the biopsy and the treatment in a single procedure.

Wedge biopsies are also taken from lymph nodes, the spleen, and other abdominal organs during open or laparoscopic surgery when a needle would not reach safely or would not provide enough tissue.

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What do the terms on your biopsy report mean?

  • Wedge resection — a triangular segment of the organ was surgically removed
  • Excisional biopsy — the entire lesion was removed, not just sampled from
  • Surgical margins — the edges of the removed tissue, checked for any abnormal cells reaching them
  • Tissue architecture — how cells are arranged across the sample; a wedge preserves this better than a needle
  • Representative sample — the pathologist is commenting on a portion of the organ, not a single isolated point

Why does a surgeon choose a wedge instead of a needle?

A needle biopsy is quicker and simpler, but it samples only a narrow column of tissue. For conditions where the arrangement of cells across a larger area is what matters for diagnosis — such as diffuse liver disease or a surface lung lesion — a wedge gives the pathologist what they need.

The choice is also shaped by what is already planned. If you are already having surgery for another reason, your surgeon can take a wedge with very little added risk. Doing a separate needle biopsy through the skin later would be an extra procedure.

Your surgeon will explain which approach is planned and why before you sign your consent form. If you are unsure which type of biopsy you are having, that is the right moment to ask.

Did you know?

A wedge resection of the lung performed by keyhole surgery can serve as both the biopsy and the treatment in a single procedure — removing the nodule completely while the diagnosis is still being confirmed by the pathologist.

For this reason, NCCN guidance on early-stage lung cancer includes wedge resection as an option for small peripheral nodules in patients who are not suitable for a larger resection.

Source: NCCN Clinical Practice Guidelines in Oncology: Non-Small Cell Lung Cancer

Explore 62 more Biopsy Techniques and How They Compare topics

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Common questions

Frequently asked questions

Is a wedge biopsy the same as surgery?

Yes — a wedge biopsy is a surgical procedure. It requires anaesthesia and either a small incision or keyhole ports, and it is performed in an operating theatre by a surgeon. This is what makes it different from a core needle biopsy or fine needle aspiration, which are done in a radiology suite or clinic room. Recovery time is also longer, though keyhole approaches are typically faster to recover from than open surgery.

Will I be put to sleep for a wedge biopsy?

In most cases, yes. Wedge biopsies are usually done under general anaesthesia, which means you will be fully asleep and will not feel the procedure. Regional anaesthesia is occasionally used instead, depending on the organ and your overall fitness. Your anaesthetist will discuss the plan with you before the procedure and explain what to expect when you wake up.

What is the difference between a wedge biopsy and an excisional biopsy?

An excisional biopsy removes the entire lesion or abnormal area. A wedge biopsy describes the shape and technique used — a triangular segment of the organ is cut out. In practice, a wedge biopsy of a small lung nodule is often also an excisional biopsy because the whole nodule is removed in the wedge. The terms describe different things: the shape of what is removed versus whether the entire lesion is gone.

How long does recovery take after a wedge biopsy of the liver or lung?

Recovery depends on whether the procedure was done by keyhole surgery or open surgery. Keyhole approaches typically involve a shorter hospital stay and a quicker return to normal activity. Your surgeon will give you a more specific estimate based on your procedure and your general health. Contact your team if you develop fever, increasing pain, or shortness of breath after a lung wedge — do not wait for your next scheduled appointment.

Can a wedge biopsy be done without a large scar?

For the liver and lung, wedge biopsies are now often performed laparoscopically or thoracoscopically — using two or three small keyhole ports rather than a large incision. This leaves small scars rather than a long one. Whether a keyhole approach is possible depends on where the lesion is, the size of the wedge needed, and factors specific to your anatomy. Your surgeon will explain which approach is planned and what to expect.

My report says 'wedge resection specimen' — what does that mean?

It means the tissue the pathologist is examining came from a wedge resection procedure — a triangular segment of organ removed surgically. The report then describes what was found in that tissue: the type of cells, whether there are abnormal findings, and whether the margins are clear. If any terms in the report are unclear, ask your oncologist to walk through the findings with you at your next appointment.

Full index

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