Type III endoleaks are secondary to leakage between the modular components or between the main body and the docking limb of a stent graft. Like type I endoleaks, these either occur early or late. If detected at the time of the procedure, typically further angioplasty is needed to form a seal. If detected late, it is usually due to material fatigue and then fracture of the stent or suture breakdown. Late type III endoleaks require additional cuff or limb placement, sometimes requiring placement of an aortouniliac device within the original stent graft with a femoral-femoral crossover graft.