The uterus is considered to be:

Which of the following locations would be considered the most common location of spina bifida?

An elevated maternal serum alpha-fetoprotein level is associated with all of the following, except:

A sonographic examination of a 32-week gestation reveals multiple anechoic fluid collections within the placenta. These most likely represent which of the following?

A 31-year-old patient presents to the ultrasound department with a history of an adnexal mass discovered on a CT examination of the pelvis. Sonographically, only the anterior element of the mass is seen, while the greater part of the mass is obscured by shadowing. What are these sonographic findings indicative of?

Which of the following could NOT result from monozygotic twinning?

Which of the following clinical symptoms would be most common in a patient with these sonographic findings?  

Which of the following would be described as the coverings of the brain and spinal cord?

This transverse transabdominal image of the gravid pelvis reveals an adnexal mass. The patient presented to the emergency room with a history of vaginal bleeding, hypertension, and excessive vomiting. Her human chorionic gonadotropin was markedly elevated. Within the uterus, a large complex mass with cystic components was identified. What is the most likely diagnosis?

A patient presents to the ultrasound department with a history of hydronephrosis. Which of the following would be the least likely pelvic cause of this abnormality?