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.
First Stricture. A1, A2: Cross-sectional area, endoscopic, 3D CT (127.8 mm2, 129.6 mm2). B1, B2: Vertical midline diameter, endoscopic, 3D CT (13.3 mm, 13.1 mm). C1, C2: Maximum vertical diameter, endoscopic, 3D CT (14.1 mm, 13.3 mm). D1, D2: Horizontal midline diameter, endoscopic, 3D CT (10.7 mm, 11.3 mm). E1, E2: Maximum horizontal diameter, endoscopic, 3D CT (10.8 mm, 11.6 mm). Fields of view = 1.
