Fibrolipomatous hamartoma of nerve arising in the brachial plexus.

Fibrolipomatous hamartoma of nerve is a rare benign infiltrating condition of peripheral nerves leading to progressive functional loss. Previous descriptions have virtually all been confined to the distal part of the upper limb, with the median nerve being the commonest reported site. Most cases occur in the first 3 decades of life and a third are associated with macrodactyly. A case is described in a 63-year-old woman, involving the whole of the brachial plexus, a previously unreported site for this particular lesion.