Abnormal superior trunk formation of brachial plexus: a case report and review of literature

Brachial plexus is a complicated network of nerves formed by fusion and splitting. Variations in the brachial plexus occur at the level of roots, trunks, cords and branches emanating from these structures. We observed a rare variation of formation of upper trunk of brachial plexus in upper right limb of female cadaver aged 70 years. This variation was observed in one limb out of total 28 limbs constituting 3.6%. The rare finding has great diagnostic and therapeutic implications and is of utmost use to anestheologists, radiologists, orthopaedic surgeons and anatomists.