What are the indications?
Common indication is to assess blocked or narrowed arteries as a cause of acute or chronic pain in the legs. Sometimes it is performed as an introduction to interventional procedure (like angioplasty/stenting of the stenosed vessel or embolization of the bleeding artery)
Same as for general angiography
Is there any additional risk?
Same as for general angiography.
Otherwise depending on intervention. Please refer to angioplasty/stenting or embolization.