Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Angle of progression on transperineal ultrasound. Transperineal ultrasound image (sagittal view) depicting the long axis of the pubic symphysis (a), angle of progression (b), and line extending from the lowermost point of the symphysis tangentially to the fetal skull contour (c).
