Challenging Cases in Rheumatology and Diseases of the Immune System is the latest title in a growing collection of thought-provoking case-based titles from Massoud Mahmoudi, D.O., Ph.D.  Like his three preceding titles, Challenging Cases in Allergy and Immunology (2009), Challenging Cases in Allergic and Immunologic  Diseases of the Skin (2010), and Challenging Cases in Pulmonology (2011), this easy-to-read title presents the topic in a challenging and enjoyable case-based format.  Developed by 30 distinguished contributors, the book consists of six parts and 16 chapters, with each chapter presenting two cases.  The style of this title follows the previous books: each topic begins with an abstract, followed by a case presentation, working diagnosis, data, final diagnosis, and discussion.  In addition, to enhance a review of the subject and stimulate critical thinking, there are 5 to 10 multiple choice questions and answers in each chapter. Challenging Cases in Rheumatology and Diseases of the Immune System is an indispensable resource for all clinicians who care for patients with rheumatic and immunologic disorders.