Aberrant vascular anatomy at the costoclavicular space: a word of caution for costoclavicular brachial plexus block.

To the Editor Since the introduction of the costoclavicular brachial plexus block (CCBPB) in 2015[1][1] we have been using it as our technique of choice for infraclavicular brachial plexus block (BPB).[2][2] At the costoclavicular space (CCS) the cords of the brachial plexus are clustered together