NT scan: can it prevent second trimester MTP complications?

Anne Johncy, G. Rohini, Lekha Shri


The NT scan (11 to 13 weeks+6 days) is used as dating scan and genetic scan. Now it is emerging as a basic checklist for examination of the whole fetal anatomy and also to identify congenital anomalies in early trimester. Arnold-Chiari malformation type II is the most common which is characterized by displacement of cerebellar tonsils, parts of the cerebellum- fourth ventricle, pons and medulla oblongata through the foramen magnum into the spinal canal. This is usually associated with hydrocephalus and myelomeningocele. This can be prevented by preconceptional folic acid supplementation. Second trimester MTP complications can be prevented if we diagnose congenital anomalies in first trimester itself.


Arnold Chiari, Folic acid, NT scan

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