emergency physicians were able to diagnose correctly ( 1 ) the presence and approximate size of pericardial effusions , ( 2 ) the presence or absence of organized cardiac activity in patient with clinical electrical mechanical dissociation , ( 3 ) the presence or absence of intrauterine pregnancy in pregnant patients with lower abdominal/pelvic complaints , ( 4 ) the position of intrauterine devices in patients with suspected uterine perforation , ( 5 ) the presence of gallstones in patients with suspected biliary tract disease , and ( 6 ) the presence and size of abdominal aortic aneurysms in patients with pulsatile masses or unexplained abdominal pain .
C0008350
gallstones
C0005424
biliary tract disease