A new addition to the highly esteemed Nelson family of pediatric references, Nelson Pediatric Textbook of Rare Diseases: Genomic Etiologies and Genetic Diagnosis, edited by Drs. Robert Kliegman and Francesc (Paco) Palau, along with Associate Editors, Drs. Basel, Gropman, Slavotinek, Bacino, Rahman and Verbsky, provides a detailed and comprehensive guide to the diagnosis of rare disorders and the approach to undiagnosed diseases-offering in-depth content on a topic often just touched on in other pediatric textbooks. Written by the most prominent experts from around the world, this definitive text is an indispensable resource for any clinician treating pediatric patients.