OK- so the female patient's breast MRI reveals something quite interesting. Previous ultrasound done at St Elsewhere revealed no focal mass. Agree?

Well, let's go back to the ultrasound images. If you compare the right breast with the left, you'll find that there's asymmetry in the images. There's a hypoechoic focus in the left breast, with thin linear septation. Of course, on MRI you see that there is an intermuscular lipomatous lesion, with some intramuscular components. And you remember that in the breast, fat is hypoechoic- as opposed to other body parts where fat is hyperechoic.


So, sometimes if it's too big you can walk past it. God gave us duplicate body parts to compare.