During radiological studies and surgeries, the branch architecture of the Axillary artery (AA) is crucial. Variations can complicate the interpretation of radiological data and cause unanticipated surgical complications. In the present situation, an uncommon collateral artery arose from the 1st part of the AA and gave rise to the lateral thoracic artery (LTA) and subscapular artery (SSA) before becoming the posterior circumflex humeral artery (PCHA). The SSA additionally gave rise to the thoracodorsal (TDA) and circumflex scapular arteries (CSA). For safe and effective surgical treatments and to prevent technical failures during catheterization and interventional procedures, it is essential to be aware of these anatomical differences.