Had breast ultrasound for breast lump and dr said it was a cyst. its been there almost 3 months but getting smaller. could this be cancerous?

Unlikely: Anything is possible, but this is most likely not cancerous. Follow up with your doctor. You may need another scan and a biopsy.

NO unlikely: At 27 cancer of breast is rare , sonogram confirms is a cyst , with your own words ' getting smaller ' with all these good signs , don't worry follow with you doctor.

Unlikely: So, you found a lump and had it evaluated with ultrasound. The ultrasound likely said "low suspicion for malignancy". If all they saw was a cyst that is now getting smaller with time, then it is unlikely to represent cancer. No matter what anyone says, have your breast exam with your doctor repeated in about 3-4 months.

Breast Cysts are...: ...Benign processes which develop when a duct becomes obstructed. With rare exception, breast cancers grow solid; therefore, if a breast lump is fluid-filled, no further evaluation is needed. Cysts require no rx, although, if it is painful or causing anxiety, aspiration can resolve the cyst. If the ultrasound was definitive, no follow-up is necessary; if equivocal, a 6 month follow-up is advised.

Breast cyst: The only way to find out, it being a cancer, is to do a biopsy. The cyst is fluid filled and not a solid mass. Also it is getting smaller and not big. If you are worried that much, then ultra sound guided fluid aspiration can be done and examined for cancer cells and you will have peace of mind when this is negative. Thanks.