Bilateral high-origin common subscapular arterial trunk arising from the second part of the axillary artery: a rare symmetrical vascular variation.

This case provides quantitative anatomical confirmation of a bilaterally symmetrical high-origin CSAT with LTA integration and side-specific distal remodeling, supporting developmental plasticity within the proximal axillary arterial network. Recognition of such configurations is clinically relevant for axillary and breast surgery, flap harvest, endovascular access, and regional anesthesia, particularly in minimally invasive or robotic-assisted settings wherevisualization is restricted and reinforces the value of patient-specific preoperative vascular mapping.