Hi - If the nodule is very small, they may want to remove the whole thing, as it might be just as simple as doing a biopsy. if it's large, then yes, you might want to have a biopsy first, to see what's up. I know this is a scary time, but it's virtually impossible for your daughter to have cancer at age 16; her chance is less than 1 in a million. Yes, it's possible; just very improbable. So please continue with the diagnostic process, but I hope you can take a deep breath, consider the odds, and stay positive, OK? Good luck to you both, and I hope things turn out well for you. - PJH
P.S. Your mother dying of leukemia would have no bearing on your daughter's breast health; only breast or ovarian cancer in an immediate relative increases breast cancer risk.
The doctor would not give you the choice of doing a biopsy or removing the nodule if waiting to get the results from the biopsy would be dangerous. It's good that the doctor is being proactive to find out exactly what kind of lump this is. Keep in mind that even in older women with a much higher cancer risk, the vast majority of lumps biopsied turn out to be benign.
You must be so pleased that your daughter trusts you enough to discuss her breast health with you. She'll need you to stay calm and reassuring through the actual surgery and waiting for the biopsy results. Usually in young women, breast lumps turn out to be a harmless type of lump called a fibroadenoma.
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