I have just been told I hzve DCIS intermediate to high grade ,I have been told they suggest implanting a radiation seed x how long will this stay in my breast and how long will I know whether this approach had been successful. The nurse also said they can’t be sure the DCIs is invasive . I have had this info by phone as on holiday and will see consultant when I’m home . If the DCIs is high grade would it be more reassuring to have a mastectomy or am I jumping the gun