A core needle biopsy revealed I had a 1.2 cm invasive ductal carcinoma tumor, grade 1, ER/PR +, HER-, K-67 score was 18 (borderline). I went in for a lumpectomy on Oct. 11-- but as they were inserting the wire, they found another spot. The MRI I had the week before did not show anything. My surgeon removed both masses in one scoop. The new spot was said to be an intramammary lymph node (located .6 cm above my 1.2 cm tumor and it was also .6 cm in size, completely mastesized). My surgeon did not get clear margins and now wants to do a mastectomy. Two sentinal nodes were removed and they were clear which she said was really good news. What significance does the intramammary lymph node mean? Is it good/bad because it was very close to the tumor? Is it common for an MRI not to pick this up? How common is it to have intramammary involvement? Both tumors, when combined, would be less than 2 cm. If my sentinal nodes are clear, and it is a grade 1 tumor, what are the chances of it spreading? The first tumor was found on a routine mammogram which I get annually. I am 43. Thanks in advance for your help.