A fine needle aspiration cytology or biopsy may be performed to remove tissue for testing. This involves inserting a needle into the breast and removing small pieces of the tumor. The tissue will then be sent to a lab for microscopic examination to determine the type of lump and if it is cancerous
FNAC may not be so specific because only few cells and fluid are removed and so many times the report may not be inconclusive
Hence it is better to do a core biopsy, the using a core biopsy gun which is able to remove 5 mm bits from the lump, which are more useful for pathologist to study and gives a more definitive report especially in doubtful cases. So although a Core biopsy is more expensive that FNAC nut can give better reports
The pain during core biopsy is minimal as a local anesthetic is injected into the skin over the biopsy site.
The sample removed is sent for histopathology testing with can take 4-5 days for the final result.