title: The use of pelvicephalography of the unengaged head in the nullipara with cephalic presentation at term: prepartum vs. intrapartum studies.
mesh_terms: D005260:Female; D005333:Fetus / Q000000981:diagnostic imaging*; D006257:Head / Q000000981:diagnostic imaging*; D006801:Humans; D007746:Labor Presentation; D010388:Pelvis / Q000000981:diagnostic imaging*; D011247:Pregnancy; D011859:Radiography