100 CASES in Clinical Medicine This page intentionally left blank Consultant Nephrologist, Guy’s and St Thomas’ NHS Foundation Trust, London, UK Gwyn Williams MDFRCP Consultant Physician and Professor of Medical Education, King’s College London School of Medicine at Guy’s, King’s and St Thomas’ Hospitals, London, UK P John Rees MDFRCP James Pattison DMFRCP Emeritus Professor of Medicine, King’s College London School of Medicine at Guy’s, King’s and St Thomas’ Hospitals, London, UK