Types of Biopsy: Core Needle Biopsy, Punch Biopsy, and Other Methods

A biopsy referral is almost always worrying, and the names of the procedures are the most confusing part. Each one is a different way of taking a piece of tissue or cells. Below is a calm explanation of what will happen.

What a biopsy is and why it is done

A biopsy is the removal of cells or tissue (a biopsy specimen) from the body during life for diagnostic purposes. The material is examined under a microscope by a pathologist; in most cases this is the only test that can say for certain whether it is cancer or not. It is ordered not only when a tumor is suspected: biopsies are taken for inflammatory and precancerous changes in gastroenterology and gynecology, and for diseases of the liver, kidneys, nervous and muscular systems.

• to understand the cause of symptoms;
• as a confirmatory test after a blood test or imaging scan;
• to monitor a long-standing disease.

The referral is given by a family doctor or a specialist; sometimes a biopsy is part of an endoscopic examination or surgery. Before the procedure, the doctor explains the preparation: sometimes certain medications must be stopped temporarily. With general anesthesia, you must not eat or drink before the procedure.

Core needle biopsy: how the material is taken

A core needle biopsy is the removal of a column of dense tissue with a hollow tube with a sharpened edge, a trephine; this is how material is taken from bones and dense tumors. A close variant is the core biopsy: a column of soft tissue is obtained with a trephine from a harpoon system and a hollow tube. The pathologist sees not individual cells but the structure of the tissue as a whole, which helps make a diagnosis and determine management.

Punch biopsy and brush biopsy

Punch biopsy is the removal of a piece of tissue with biopsy forceps. For cytological examination, material is taken differently: an imprint smear is scraped with a spatula, scalpel, or cytobrush and transferred to a slide; this cell sampling is called a brush biopsy. The difference is fundamental: histology shows the structure of the tissue, cytology shows only the cells.

Fine-needle and vacuum aspiration biopsy

Fine-needle aspiration biopsy (FNAB) is the collection of material with a puncture needle and syringe; it is used for both cysts and solid tumors. Aspiration biopsy is a variant of FNAB for fluid-filled formations: cysts, fluid from the pleural or abdominal cavity. Reference sources do not provide material on the vacuum variant; clarify the method with the doctor who referred you. Such procedures are often performed under image guidance, with ultrasound or X-ray.

Excisional and incisional biopsy: what the difference is

An excisional biopsy is the complete excision of a pathological formation. An incisional biopsy is the removal of only part of it or a fragment of a diffusely changed organ. Separately distinguished are scarification, or superficial, biopsy — shaving a thin layer from the surface of a formation, as is done for skin changes — and loop biopsy — sampling with a loop of a coagulator or radiofrequency device in ENT practice, gynecology, and endoscopy. By accuracy control, a distinction is made between classical and image-guided biopsy: endoscopic, ultrasound- or X-ray-guided, stereotactic.

What the result shows and when to expect it

The material is sent to the laboratory. Histological examination requires preparation: the tissue is dehydrated, impregnated with paraffin, cut with a microtome into sections from 3 micrometers thick, stained, and examined under a microscope. The result comes in a few weeks, sometimes longer; the timing depends on the laboratory and on why the biopsy was needed. If there is no answer after a few weeks, call the clinic where the material was taken: sometimes a repeat biopsy or other tests are needed.

Most biopsies are done under local anesthesia: the person is conscious and does not feel pain; if necessary, sedation or general anesthesia is added. Some procedures take less than 30 minutes, some longer. You can usually go home the same day; if there are stitches or a dressing, the team will explain care. After a biopsy of the uterus or cervix, cramping and slight bloody discharge may occur.

If after a biopsy the pain intensifies or does not go away after painkillers, a high fever develops, blood or fluid oozes from the sampling site, or the area swells or reddens — contact your care team immediately.

A biopsy itself is not a reason to call an ambulance; 103/112 — if after the procedure the condition sharply worsened and life-threatening signs appeared.

What to ask in advance: by what method the material will be taken, whether preparation is needed, and when and how the result will be communicated. If waiting for the conclusion is hard, tell your doctor — they will suggest where to turn for support. This material is for reference and does not replace a doctor's consultation.

This content is for reference and does not replace a doctor's consultation. Medical disclaimer