Fig. 2.

This figure includes six CT or MR images of the left atrium and pulmonary veins viewed from the posterior perspective. Common and uncommon variations in PV anatomy are shown. a Standard PV anatomy with 4 distinct PV ostia. b Variant PV anatomy with a right common and a left common PV. c Variant PV anatomy with a left common PV with a short trunk and an anomolous PV arising from the right posterior left atrial wall. d and e Variant PV anatomy with a common left PV with a long trunk. f Variant PV anatomy with a massive left common PV