A Text Atlas of Nail Disorders Techniques in Investigation and Diagnosis Third edition Robert Baran, MD Nail Disease Centre Cannes, France Rodney PR Dawber, MA, MB ChB, FRCP Consultant Dermatologist Churchill Hospital, Oxford, UK Eckart Haneke, MD Klinikk Bunaes Sandvika/Oslo, Norway Antonella Tosti, MD Associate Professor of Dermatology, University of Bologna Bologna, Italy Ivan Bristow, MSc, BSc, DPodM, MChS Podiatrist, University College of Northampton Northampton, UK With contributions from Luc Thomas, MD, PhD Professor of Dermatology, University of Lyon, France Jean-Luc Drapé, MD, PhD Professor of Radiology, Hôpital Cochin, University of Paris Paris, France LONDON AND NEW YORK © 1990, 1996, 2003, Martin Dunitz, a member of the Taylor & Francis Group First published in the United Kingdom in 1990 by Martin Dunitz, Taylor & Francis Group plc, 11 New Fetter Lane, London EC4P 4EE Tel: +44 (0) 20 7583 9855 Fax: +44 (0) 20 7842 2298 E-mail: