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Femoropopliteal (FP) disease grading in Global Limb Anatomic Staging System (GLASS). Trifurcation is defined as the termination of the popliteal artery at the confluence of the anterior tibial (AT) artery and tibioperoneal trunk. CFA, Common femoral artery; CTO, chronic total occlusion; DFA, deep femoral artery; Pop, popliteal; SFA, superficial femoral artery.
