title: Chorionic tissue biopsy in the first trimester of pregnancy.
mesh_terms: D001707:Biopsy, Needle; D002478:Cells, Cultured; D002824:Chorionic Villi / Q000473:pathology*; D002869:Chromosome Aberrations / Q000175:diagnosis*; D025063:Chromosome Disorders; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D006801:Humans; D010920:Placenta / Q000473:pathology*; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011296:Prenatal Diagnosis; D014327:Trophoblasts / Q000473:pathology