MUST 2019 was held in Detroit, Michigan, USA. The program of the two-day workshop included six invited talks, 21 oral presentations and 15 posters. The presentations covered the history and future trends of ultrasound tomography, the clinical motivation and status of breast imaging as well as commercial developments. Dedicated discussion sessions with the audience covered the current challenges and future directions of ultrasound tomography. The conference was attended by 42 participants from 10 countries.