DOI: http://dx.doi.org/10.18203/2320-1770.ijrcog20182375

NT scan: can it prevent second trimester MTP complications?

Anne Johncy, G. Rohini, Lekha Shri

Abstract


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.


Keywords


Arnold Chiari, Folic acid, NT scan

Full Text:

PDF

References


Grossman D, Blanchard K, Blumenthal P. Complications after second trimester surgical and medical abortion. Reproductive Health Matters. 2008 May;16(31):173-82.

Davies V, Gledhill J, McFadyen A, Whitlow B, Economides D. Psychological outcome in women undergoing termination of pregnancy for ultrasound-detected fetal anomaly in the first and second trimesters: a pilot study. Ultrasound Obstet Gynecol. 2005 Apr;25(4):389-92.

Seshadri S. Shifting the fetal anomaly scan to the first trimester. Ultrasound Medicine Biol. 2017;43(S1).

Jiang J, Zhang Y, Wei L, Sun Z, Liu Z. Association between MTHDI G1958A polymorphism and neural tube defects susceptibility: a meta-analysis. PloS One. 2014 Jun;9(6):e1011169.

Nejadi MN, Zafarani F, Ahmadi F, Rashidi Z. Arnold-Chiari type II malformation: a case report and review of prenatal sonographic findings. Int J Fertil Steril. 2007 Apr;1(4).

Goldstein RB, Podrasky AE, Filly RA, Callen PW. Effacement of the fetal cisterna magna in association with myelomeningocele. Radiology. 1989 Aug;172(2):409-13.

McLone DG, Dias MS. The Chiari II malformation: cause and impact. Childs Nerv Syst. 2003;19(7-8): 540-50.

Barkovich JA. Congenital malformation of the brain and skull. In: Barkovich JA(ed). Pediatric Neuroimaging. 4th ed. Philadelphia, PA: Lippincott Williams & Wilkins;2005:378-84.

Elamaran E, Daniel S, AN RG. A prospective study to evaluate the efficacy of 11-13+ 6 weeks anatomy scan in detecting fetal structural anomalies compared to traditional 18-22 weeks scan. Int J Reprod Contracept Obstet Gynecol. 2017 May;6(6):2431-7.