There are multiple definitions:

1. lower uterine segment(English)

   • Gynecology

2. lung ultrasound(English)

   • a useful and noninvasive tool to detect lung involvement and monitor changes in patients with COVID-19
   • COVID-19
   • Pulmonology, Medical imaging, Ultrasound, Monitoring
   • https://doi.org…054-020-03416-1
   • https://doi.org…431-019-03428-2