(HealthDay)—Fetoscopic endoluminal tracheal occlusion (FETO) offers significant benefit for singleton fetuses with severe, but not moderate, isolated congenital diaphragmatic hernia on the left side, according to two studies published online June 8 in the New England Journal of Medicine to coincide with the International Society for Prenatal Diagnosis 25th International Conference on Prenatal Diagnosis and Therapy, held virtually from June 6 to 8.