Cut core biopsy

Hi,

 

I have suffered for many years with cysts, found a new lump 3 weeks ago and last Wednesday went to the hospital. Had the routine mammogram and ultrasound where they tried to aspirate it. No fluid came out so had to have a cut core biopsy, was told it looked irregular. I am prepared that this could be a 50-50 has anyone else had this problem. Thanks in advance x