This third edition of the work, directed by the Spanish Society of General and Family Medicine (SEMG), is an essential guide for healthcare professionals seeking to master abdominal ultrasound - coined as "the stethoscope of the 21st century" - an indispensable diagnostic tool. • It features a completely revamped collection of images and original illustrations. • It is enriched with a new atlas of ultrasound images of the most common abdominal pathologies. • It maintains its pedagogical approach to explaining the basic principles and examination techniques, offering the reader comprehensive and practical learning. ABCs of Abdominal Ultrasound is an educational tool and an invaluable resource designed to consolidate and update knowledge in this field for those who aspire to enter the wonderful world of ultrasound and take their clinical and diagnostic practice to the next level.