Fig. 2

Calcified PDA. V: volume-rendered three-dimensional image shows PDA. A, B and C show multiplanar reformations (MPR) where the diameters of the duct were measured, respectively, at its aortic origin, at its middle third and distal third, at the entrance to the left pulmonary artery. D: The MPR image in the coronal plane shows the PDA between the aorta and the left main pulmonary artery, assuming the appearance of a small satellite between two planets (satellite sign, yellow arrowhead). E: axial view reveals a positive jet of contrast from the aorta to the less-opacified pulmonary artery (spot sign, yellow arrowhead) F: MPR image of PDA in the sagittal plane as a tubular structure in its entire length. G: the virtual angioscopic CT image does not show a linear valve-like structure at the pulmonic end of the PDA