Canine patent ductus arteriosus (PDA) echocardiography
This is nothing very radical but when I started echo-ing I struggled for ages to get my brain around how to visualise PDAs. The degree of visibility does depend a bit on the individual dog’s conformation and how closely the main pulmonary artery and aorta are in approximation. This particular dog: a Springer Spaniel gives especially nice views.
Left cranial long axis view (cranial to right of image):
With the probe in the left armpit aligned with the long axis of the heart, the image which usually presents itself is of the ascending aortic root: