As a graduate of 12 years of Catholic school, I learned about (and committed most of) the 7 deadly sins.  I spend much of my time now teaching residents ultrasound, and reviewing their images.  In the 7 major US categories (AAA, Biliary, Cardiac, FAST, OB, Renal, and Vascular Access), I have noticed there are common mistakes most novices make.  So what are these 7 Deadly US Sins, and how can we avoid them?