A rather laborious and long-winded  demonstration of two specific points:

1. The distance between the nipple and a "lesion" should be the same on both views. Use your right hand, the second and fifth fingers and plot the distance running up and down on the initial and then second image. A "real" lesion should lie on this line. It's a valuable aid to find a lesion on a second image. Try it, it works. And it is free.

2. The more you do something, the better you get. Breast imaging is like golf. If you do lots of breast ultrasounds you become proficient. And vice versa. If you work in a low volume ultrasound setting, do not hesitate to consult with a colleague and get a second opinion and if needs be (like in this case) another study.