My gp thinks my breast lump is a cyst - Im 47 so prime age for this. Consequently I have been refereed for a routine mammogram with a 4 week wait. What if she is wrong about it being a cyst? I am trying not to panic but unwanted thoughts keep creeping in. she couldn't be 100% sure hence the referral. Is the month long wait going to be of huge significance if I have a malignant tumour?