Would I still have late stage breast cancer if mammography and sonography have found nothing?
Answer To be on the safe side I would also suggest an MRI breast scan! Well so far we have some indications that this may be a breast cancer but no sure breast cancer has been found! So I would call this lymph node metastases of unknown origin (but where a breast cancer is suspected also due to the location of the lymph node lesions). Another thing that should be done is a CT scan of your lungs in order to rule out if possible anything there. Another thing that can be done is a PET scan to search for tumor suspect lesions anywhere and everywhere. Therapywise I would suggest radiation therapy against your lymph node lesions (after biopsy confirmation) and chemo therapy. Good luck! Please keep me posted!