title: First-trimester chorion biopsy.
mesh_terms: D001706:Biopsy / Q000379:methods; D001707:Biopsy, Needle / Q000379:methods; D002823:Chorion / Q000033:anatomy & histology; D002824:Chorionic Villi / Q000473:pathology*; D005260:Female; D006801:Humans; D010920:Placenta / Q000473:pathology*; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011296:Prenatal Diagnosis / Q000379:methods*