title: Chorionic villi sampling under direct vision.
mesh_terms: D001706:Biopsy; D002824:Chorionic Villi / Q000473:pathology*; D004724:Endoscopy; D005260:Female; D006801:Humans; D007621:Karyotyping; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*