Hi you should ask them if they going to biopsy the mass it may be nothing to worry about but ive recently been in ur situation and they say they cant find my 3new lesions in breast which showed up in ultrasound so anxiety through the roof so I told my breast specialist for other breast off and sentinel node biopsy and im getting immediately tissue expanders then implants so ask them all the questions dont leave oncologist or breast specialist till all ur questions are answered all the best x