This volume on Rarer Arthropathies, part of the series  Rare Diseases of the Immune System  aims to fill a gap in the literature by informing and updating clinicians on the unusual and uncommon forms of arthritis and related musculoskeletal conditions. It will be a valuable go-to resource for clinicians to support them in differential diagnosis, in particular when facing unusual presentations. Nineteen chapters written by experts have covered a wide range of these conditions, providing first rate information on topics yet lacking adequate coverage; from Palindromic Rheumatism to SAPHO Syndrome and other chronic immune-mediated conditions, while also including arthritis in leprosy, tuberculosis and chikungunya. Smaller, crisp paragraphs and apt subheadings will help the readers in easily understanding the up to date information provided in the chapters.