Photon-counting CT angiography for anatomical assessment of patent ductus arteriosus in a child.

Patent ductus arteriosus requires accurate delineation when non-invasive anatomical definition is needed. We describe a 10-year-old girl in whom photon-counting CT angiography demonstrated a ductus connecting the descending thoracic aorta and proximal left pulmonary artery. Multiplanar and three-dimensional images defined the diameter, length, and spatial relationships. Photon-counting CT may complement echocardiography when detailed anatomical assessment is required.