I had both a mammogram and an ultrasound this morning. The radiologist interpreting the tests diagnosed me as having gynecomastia, which is the development of large mammary glands in males, resulting in breast enlargement. This can be caused by certain prescription drugs or by changes in sex-related hormones; many cases have no clear cause.
In my case, I'm not taking any drugs known or even suspected to cause gynecomastia.
The radiologist indicated that the lump is benign, and there's no need for any follow up treatment. That's why the elephant is doing a happy dance.
