Technical pitfalls in ultrasonic B scan examination.
D000022:Abortion, Spontaneous / Q000175:diagnosis; D004582:Electronics, Medical; D005260:Female; D005333:Fetus / Q000033:anatomy & histology; D006801:Humans; D010048:Ovarian Cysts / Q000175:diagnosis; D010920:Placenta / Q000033:anatomy & histology; D011247:Pregnancy; D014463:Ultrasonography; D001749:Urinary Bladder Neoplasms / Q000175:diagnosis; D014599:Uterus / Q000033:anatomy & histology