Hi Kimmy - A multiseptated nodule is a growth comprised of numerous parts; think of it as "gnarly" rather than smooth. Cysts are often multiseptated; and this may be a cyst, but they couldn't quite say for sure - thus the 3-month wait, while they see if it changes.

This "watchful waiting" is pretty common, and it usually means they're not that worried about whatever it is being cancer - because if they were, they'd have you in for an immediate biopsy. So, try not to stress about this too much. But if you do find yourself becoming very worried, you can always ask for an immediate biopsy, to clear things up for sure. Not certain insurance would pay for it, since the doctor isn't recommending it at this point; but if you feel like you're unable to wait for 3 months, you can always ask if it's an option.

FYI, your aunt having breast cancer does raise your risk, but only by a very small amount. It's still much more likely that this growth is something other than cancer. Take care- PJH