MRI-Essentials.com is based on a brief work first published in 2002 that was intended as a tool for daily musculoskeletal practice. Short paragraphs and simple drawings covered the basic facts of musculoskeletal MRI. Feedback over the years suggested that many working radiologists preferred this concise style over the usual textbook exposition. The success of this early effort lead us to extend the concept: short text passages with accompanying drawings were expanded where further explanation was helpful, and hundrets of illustrations were added. Maintaining the original concept, the text passages are deliberately very short and focus on the clinically relevant facts.