case_images: PMC7191913_01
case_images: (a-d) Intraoperative photographs and graphic illustration of the left 2nd intercostal space demonstrating the "venous ring" of the internal mammary vein, medial to the artery.
case_images: ICRP_A_1754129_F0001_C.jpg
case_images: PMC7191913_01_ICRP_A_1754129_F0001_C.jpg
case_images: F0001
case_images: The vein, exposed between the second and third costal cartilages, exhibited unusual anatomy in the form of the single vein forming a 'bifurcation', quickly followed cranially by the two vessels converging back into a single vessel, thus creating a venous 'ring' (Figure 1(a-c)).