[What's new in nail surgery?].

The author review the literature concerning progress in nail surgery. He presents several basic research studies on the blood supply of the ungual apparatus, very rare studies on pathophysiology and the contribution of magnetic resonance imaging. In practice, progress or new techniques in traumatology (haematomas, wounds of the nail bed and matrix, defects, distal amputations through the nail) and in the context secondary dystrophic lesions are considered. In particular, the indications for emergency and secondary microsurgery are defined. The only novelty in neoplastic disease concerns the discovery of a new tumour: onychomatricoma.