title: Early second-trimester sonographic diagnosis of thoracopagus twins.
mesh_terms: D000028:Abortion, Induced; D000328:Adult; D005260:Female; D006801:Humans; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011296:Prenatal Diagnosis; D014428:Twins, Conjoined; D014463:Ultrasonography