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Breast Biopsy - CNB

Last Updated on Jan 27, 2016
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What is Core Needle Biopsy (CNB)?

A core needle biopsy (CNB) is a percutaneous (through the skin) procedure that involves removing small samples of breast tissue using a hollow ‘core’ needle.

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The needle used in core needle biopsy is larger than the one used in FNAC. The needle has a special cutting edge. The breast area is locally anesthetized after localizing the lump. The lesion is fixed with one hand and a freehand needle biopsy is performed with the other.

In the case of non-palpable lesions (those unable to be felt), stereotactic mammography or ultrasound image guidance is used.

The core needle biopsy procedure takes only a few minutes, and most patients are able to resume normal activity almost immediately afterwards.

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Advantages of CNB

  • Core needle biopsy usually allows for a more accurate assessment of a breast mass than fine needle aspiration because the larger core needle usually removes enough tissue for the pathologist to evaluate abnormal cells in relation to the surrounding small sample of breast tissue taken in the specimen.

Disadvantage of CNB

  • It allows only samples of a mass and not the entire area of concern. Therefore, it is possible that a more serious diagnosis may be missed by limiting the sampling of a lesion.

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