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Inadvertent intra-neuronal needle placement during a popliteal sciatic nerve block A). The triangle indicates the needle tip inside the nerve and the arrows indicate the anterior and posterior aspects of the nerve. The inadvertent intra-vascular needle placement during an axillary nerve block B) m, median nerve, triangle reveals needle tip in axillary vein (AV); AA, axillary artery. Photo courtesy of Robert Weller, MD.
