Core Needle Biopsy

A core needle biopsy test uses a thicker needle than an FNAC and is able to take a very small slither of tissue. Because the tissue is intact as opposed to individual cells, more information is derived from this type of test. In particular the architecture of the breast tissue can be examined microscopically.

We always use an injection of local anaesthetic prior to the core needle biopsy. After injection of local anaesthetic there is a short and relatively mild stinging sensation. This rapidly wears off leaving the area of the breast completely numbed. As a result most patients will not feel anything further during the core needle biopsy procedure. The core needle biopsy is performed under ultrasound control so that we can be sure that the needle goes into the right place. The needle mechanism is worked by a hand held machine that makes a sharp snapping noise when the biopsy is taken. The biopsy is usually done 2-3 times with the needle being removed between each biopsy. It is necessary to press hard on the sight of the biopsy following the procedure to minimise any bruising. However many patients will develop a bruise over the next 24-48 hours. The local anaesthetic lasts for approximately 2 hours and if any soreness remains following this you can safely take either 1 or 2 paracetamol tablets (500-1000mg in total) to provide effective pain relief. Most patients however find a needle biopsy quite comfortable and uncomplicated.

The small tissue obtained from a core needle biopsy needs extensive processing before it is ready to be examined by the Consultant pathologist under a microscope. This usually takes 3-4 days and the final result therefore is not available at the time of the biopsy. It will therefore be necessary to return to discuss the final results after standard processing procedures have been carried out 4-5 days later.

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