Not only is ultrasound useful for checking the genitals on your developing fetus, but it is also a valuable resource in checking for fluid in the abdomen during trauma situations — the FAST exam. I learned the exam this week. My favorite moment was when I myself revealed a near perfect image of the heart: it looked just like this one, only inverted. And without a hole in the atrial septum (a.k.a. ostium secundum). Maybe the image is upside down because it’s from Germany? Anyway, I just wanted to hold that probe in place for a minute and enjoy my moment of glory. Can you identify the chambers of the heart? Let the septal defect be your guide.