Hi warwick01
Do not panic. You have been recalled to the main breast care department where you will see a breast surgeon, have some more mamos and an ultrasound, if they find anything they will perform either a fine needle aspiration or a core biopsy. A core is taken using local anaesthetic same as dentist uses then a biopsy is taken using a special needle. Most lumps are harmless! If it did turn out to be cancer you have got it early and treatment is very effective these days. Ring the breast care unit speak to the breast care nurse for support.
Good luck
Sweaty bet.