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PAPVRPartial Anomalous Pulmonary Venous Return
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Right-sided PAPVR consists of anomalous drainage of a right pulmonary vein to superior vein cava, azygos vein, coronary sinus, or inferior vena cava.
Left-sided PAPVR usually drains into the left brachiocephalic vein, often through a vertical vein.
Although PAPVR normally drains into a vessel located in the proximity, that is, into right-sided vein for right lung pulmonary veins and into a left-sided vein for the left lung pulmonary veins, some rare cases of "cross mediastinal drainage" are reported [7].
However, we cannot consider it to be a very rare finding associated with PAPVR, because most of the cases of PAPVR reported in the literature do not clearly reveal if they are associated with any accessory pulmonary veins.
PAPVR may be suspected at echocardiography; however, the lack of adequate acoustic windows makes it difficult to detect through this diagnostic technique [5].
CT and magnetic resonance (MR) imaging represent diagnostic techniques of choice in diagnosis and characterization of congenital pulmonary vein anomalies and in particular of PAPVR.
Moreover, PAPVR is often incidentally found during CT exams performed for other unrelated conditions.
CT examination should be performed with injection of contrast medium, although some authors suggest that PAPVR may be detected in nonenhanced CT acquisition.