References
- Cicero S, Curcio P, Papageorghiou A, Sonek J, Nicolaides K. Absent of nasal bone in fetuses with trisomy 21 at 11–14 weeks of gestation: an observational study. Lancet 2001;358:1665–1667.
- Cicero S, Rembouskos G, Vandecruys H, Hogg M, Nicolaides KH. Likelihood ratio for trisomy 21 in fetuses with absent nasal bone at the 11–14-week scan. Ultrasound Obstet Gynecol 2004;23:218–223.
- Leung TY, Sahota DS, Chan LW, Law LW, Fung TY, Leung TN, Lau TK. Fetal nasal none status in Chinese women undergoing first trimester screening for trisomy 21. Am J Obstet Gynecol 2008;199:521.e1–521.e5.
- Cicero S, Sonek JD, McKenna DS, Croom CS, Johnson L, Nicolaides KH. Nasal bone hypoplasia in trisomy 21 at 15–22 weeks' gestation. Ultrasound Obstet Gynecol 2003;21: 15–18.
- Bunduki V, Ruano R, Miguelez F, Yoshizaki CT, Kahhale S, Zugaib M. Fetal nasal bone length: reference range and clinical application in ultrasound screening for trisomy 21. Ultrasound Obstet Gynecol 2003;21:156–160.
- Odibo AO, Sehdev HM, Sproat L, Parra C, Odibo L, Dunn L, Macones GA. Evaluating the efficiency of using second-trimester nasal bone hypoplasia as a single or a combined marker for fetal aneuploidy. J Ultrasound Med 2006;25:437–441.
- Odibo AO, Sehdev HM, Gerkowicz S, Stamilio DM, Macones GA. Comparison of the efficiency of second-trimester nasal bone hypoplasia and increased nuchal fold in Down syndrome screening. Am J Obstet Gynecol 2008;199:281.e1–281.e5.
- Chen M, Lee CP, Leung KY, Hui PW, Tang MHY. Pilot study on the midsecond trimester examination of fetal nasal bone in the Chinese population. Prenat Diagn 2004;24:87–91.
- Benacerraf BR, Frigoletto FD Jr, Laboda LA. Sonographic diagnosis of Down syndrome in the second trimester. Am J Obstet Gynecol 1985;153:49–52.
- Parra-Cordero M, Quiroz L, Rencoret G, Pedraza D, Munoz H, Soto-Chacon E, Miranda-Mendoza I. Screening for trisomy 21 during the routine second-trimester ultrasound examination in an unselected Chilean population. Ultrasound Obstet Gynecol 2007;30:946–951.
- Smith-Bindman R, Hosmer W, Feldstein V. Second-trimester ultrasound to detect fetuses with Down syndrome – a meta-analysis. JAMA 2001;285;1044–1055.
- Bethune M. Time to reconsider our approach to echogenic intracardiac focus and choroid plexus cysts. Aust N Z J Obstet Gynaecol 2008;48;137–141.
- Lau TK, Evans MI. Second-trimester sonographic soft markers: what can we learn from the experience of first-trimester nuchal translucency screening? Ultrasound Obstet Gynecol 2008;32:123–125.
- Bethune M. Literature review and suggested protocol for managing ultrasound soft markers for Down syndrome: thickened nuchal fold, echogenic bowel, shortened femur, shortened humerus, pyelectasis and absent or hypoplastic nasal bone. Australas Radiol 2007; 51: 218–225.