“…The plexus may be primarily damaged (e.g., by car or motorcycle accidents, traction injuries, median sternotomies in cardiac operations, internal jugular vein cannulation, occult fractures of the first or second ribs, or gunshot wounds) or secondarily involved by disease processes that either affect the axillary contents (e.g., abnormal lymph nodes or axillary fibroses) or spread from neighboring structures such as bone, muscle, breast, or lung (2,8,10,20,22,25,28,40). The incidence of BP birth injuries varies from 1 to 2 per 1000 live births (35).…”