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What Is a Core Needle Biopsy Gun?

A core needle biopsy gun is a spring-loaded medical device used to collect small cylinders of tissue from the body. It holds and advances a hollow biopsy needle into the target area. The tissue sample is called a core because it preserves more tissue structure than a fine needle aspiration sample. Core needle biopsy guns are used by trained clinicians in clinics, radiology suites, procedure rooms, and operating settings.

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What Is a Core Needle Biopsy Gun?

A core needle biopsy gun is a spring-loaded medical device used to collect small cylinders of tissue from the body. It holds and advances a hollow biopsy needle into the target area. The tissue sample is called a core because it preserves more tissue structure than a fine needle aspiration sample. Core needle biopsy guns are used by trained clinicians in clinics, radiology suites, procedure rooms, and operating settings.

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What Is a Core Needle Biopsy Gun Used For?

A core needle biopsy gun is used when a clinician needs a tissue sample for diagnosis. It may be used for breast lumps, lymph nodes, liver lesions, kidney lesions, prostate tissue, soft tissue masses, or other abnormal areas. Imaging guidance such as ultrasound, mammography, CT, or MRI may be used to target the correct site. The sample is sent to pathology for microscopic examination and sometimes additional testing.

How a Core Needle Biopsy Gun Works

The device contains a hollow cutting needle and a spring mechanism. After the target area is numbed and positioned, the needle is placed near or into the lesion. When activated, the spring quickly advances the needle to capture a narrow core of tissue. Several cores may be collected to improve diagnostic yield.

Types of Core Needle Biopsy Devices

Core biopsy devices can be manual, semi-automatic, or fully automatic. Some are used with coaxial introducer needles so multiple samples can be taken through one access path. Vacuum-assisted biopsy systems are related devices that can collect larger or multiple tissue samples. Needle size, throw length, and imaging guidance depend on the target tissue and procedure plan.

Risks and Aftercare

Possible risks include bleeding, bruising, pain, infection, swelling, tissue injury, pneumothorax in lung or chest procedures, or inadequate sample. Patients may need pressure, a dressing, activity limits, and follow-up instructions after biopsy. Blood-thinning medicines and bleeding disorders should be reviewed before the procedure. Heavy bleeding, fever, worsening pain, shortness of breath, or spreading redness should be reported promptly.

FAQs About Core Needle Biopsy Guns

Is a core needle biopsy gun used for cancer diagnosis?

Yes. It can collect tissue that helps diagnose or rule out cancer, but pathology review is needed to interpret the sample.

Is core needle biopsy the same as fine needle aspiration?

No. Core needle biopsy removes small tissue cores, while fine needle aspiration removes cells or fluid with a thinner needle.

Does a core needle biopsy gun hurt?

Local anesthetic is usually used, so patients may feel pressure, vibration, or brief discomfort rather than sharp pain.

Can a core needle biopsy miss the target?

Yes. Sampling error can happen, especially with small or hard-to-reach lesions. Imaging guidance and multiple samples can help reduce this risk.

References

Core Needle Biopsy of the Breast. American Cancer Society. https://www.cancer.org/cancer/types/breast-cancer/screening-tests-and-early-detection/breast-biopsy/core-needle-biopsy-of-the-breast.html. Date Accessed June 18, 2026.

Needle biopsy. Mayo Clinic. https://www.mayoclinic.org/tests-procedures/needle-biopsy/about/pac-20394749. Date Accessed June 18, 2026.

General Biopsy. RadiologyInfo.org. https://www.radiologyinfo.org/en/info/biopgen. Date Accessed June 18, 2026.

Core Needle Biopsy of the Breast. Cleveland Clinic. https://my.clevelandclinic.org/health/diagnostics/core-needle-breast-biopsy. Date Accessed June 18, 2026.

Core Needle and Open Surgical Biopsy for Diagnosis of Breast Lesions. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK246881/. Date Accessed June 18, 2026.