Nonatherosclerotic peripheral artery disease (NAPAD) remains underappreciated compared to atherosclerotic peripheral artery disease. However, under-or misdiagnosis of NAPAD can potentially lead to serious adverse outcomes. There is a broad spectrum of disorders including vasculitis, thrombophilia, and other vascular anatomical or functional disorders in the context of NAPAD. This section briefly overviews vascular imaging, mainly invasive angiography, to optimize the management of NAPAD.