This no doubt is an enlarged lymph node and these nodes can become enlarged for a variety of reasons. One main reason is an infection some place in the body and very often even after the infection has cleared the node will not return to it's original size. If there were reason for concern after all the tests you have had I'm sure some further action would have been recommended. If this lump has not changed in over a year then I see no reason to be concerned just as the Dr.s have told you. I certainly would keep up with yearly mammograms at your age to keep track of any changes that might occur. Kindest regards ......
Hi,
This swelling in your armpit could be a cyst or a swollen lymph node. When there is infection or inflammation somewhere in the body, a lymph node in the axilla area may enlarge. Sometimes it goes away on its own but can also linger for a long time. I am sure that when you’ll go for another checkup in 6 months, the Radiologist will also check the lump in your armpit to ensure that it is not continuing to grow, which may require further investigation.
Try not to worry, if there was something suspicious about the lump in your armpit, or the cyst in your breast, the Mammogram and Ultrasound tests would have shown it and the Radiologist would have certainly ordered a biopsy.
Best wishes …