This book is about the spleen, a mysterious organ, covering all aspects of its anatomy, physiology, and medical and surgical conditions affecting the spleen. It covers the most areas critical for decision making such as patient's presentation, diagnosis, and management. This book considers the recent developments in diagnosing and treating medical and surgical conditions affecting the spleen, including minimally invasive surgery. It is a quick reference book, well-illustrated, and easy to read and understand. This book should be helpful to medical consultants, surgeons, hematologists, and pediatric surgeons. It also benefits specialists, fellows, medical students, and nurses. The illustrations in this book are clear and include clinical, radiological, operative, pathological, and diagrammatic pictures. These illustrations are detailed, making them easy to grasp and understand.