<s>[INST] my mother in law has a small infection on the brest which cause her to get a medical report as instructed by a surgeon . the medical report says FNA left breast lump: Suspicious smears C4. the doctor suspect this may be for breast cancer but he wanted to under go for a operation before confirm. please tel me wheather to go ahead or not [/INST] If FNAC is suspicious of cancer, you need to go for biopsy. Biopsy are of two types. if the mass is large, you can go for trucut biopsy where a needle is passed into the lump and tissue is removed, almost similar to FNA but needle bore is wide. If the lump is small, best would be excision biopsy where the entire lump is removed and sent for biopsy. Biopsy is mandatory for final diagnosis </s>