[Real macrodactylia affecting the nerves]

Real macrodactylia is a rare congenital abnormality of unknown etiology, characterized by excessive growth of the anatomical structures of one or several rays of the hand. It is usually isolated and causes a fibrofatty infiltration mainly involving the palm. It can be caused by embryonic or neurogenic abnormalities with or without nerve involvement according to whether macrodactylia has led to an increase in the volume of a major nerve, more often the median. From an evolutionary point of view, it is necessary to distinguish between static macrodactylia (present at birth and remaining stable during growth) and progressive macrodactylia (with a disproportionate growths). Some other syndromes, tumors or abnormalities can cause an increase in finger volume. This abnormality results in functional disability but also in disfigurement. Treatment is based on surgery and rehabilitation.