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Clinical significance of sonographic soft markers: A review
Journal of Genetic Medicine 2018;15:1-7
Published online June 30, 2018;
© 2018 Korean Society of Medical Genetics and Genomics.

Mi Sun Kim, Sukho Kang, and Hee Young Cho

Department of Obstetrics and Gynecology, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea
*Hee Young Cho, M.D.,, Department of Obstetrics and Gynecology, CHA Bundang Medical Center, CHA University School of Medicine, 59 Yatap-ro, Bundang-gu, Seongnam 13496, Korea. Tel: +82-31-780-5985, Fax: +82-31-780-5069, E-mail:
Received December 22, 2017; Revised March 16, 2018; Accepted March 22, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Sonographic findings with little or no pathological significance, known as soft markers, are often found in aneuploidy fetuses. After normal screening for the aneuploidy in first trimester, there are no uniform recommendations regarding when to disregard or put on clinical significance in isolated soft markers. Associations between some soft markers and adverse pregnancy outcomes including intrauterine fetal death, preterm birth, fetal growth restriction, and congenital infection have been reported in euploidy fetuses. The present article aims to review recent literatures about the clinical significance of soft markers after normal first trimester combined screening or noninvasive prenatal testing, and propose a simple clinical summary for management of specific soft markers in pregnancies.

Keywords : Aneuploidy, Ultrasonography

In past several decades, ultrasound screening during the second trimester to identify fetal anomalies has developed and improved remarkably. Some sonographic findings are structural signs with little or no pathological significance, commonly known as soft markers [13]. Generally studied soft markers include fetal ventriculomegaly (VM), choroid plexus cyst (CPC), absent or hypoplastic nasal bone, a thickened nuchal fold (NF), intracardiac echogenic focus (IEF), echogenic bowel, short long bones, pyelectasis, and single umbilical artery (SUA). Soft markers are common and they are not usually associated with any handicaps, unless there is an associated chromosomal abnormality [4].

The ultrasound soft markers are found in the 5 major chromosomal aneuploidies: trisomies 21, 18, and 13; Turner syndrome; and triploidy [5,6]. Use of the soft markers may increase the positive predictive value in patients with first trimester combined screening (FTS) (combination of maternal age, biochemical screening tests of free β-hcg and PAPP-A, and nuchal translucency) [7]. Routine karyotyping of all pregnancies with these markers would have major implications, both in terms of miscarriage and in economic costs. However, the introduction of noninvasive prenatal testing (NIPT) with cell-free fetal DNA from maternal plasma may enabled to deal with soft markers as indicators of fetal chromosomal abnormalities [1,4,7]. NIPT is used for screening trisomies 21, 18, and 13 and potentially some sex chromosome aneuploidies and some microdeletion [8]. Its sensitivity for trisomy 21 approaches 99% but these tests do not provide information on other chromosomal aberrations [9]. NIPT and invasive prenatal testing are acceptably offered in high risk population (advanced maternal age, abnormal FTS results, history of fetal aneuploidy, known balanced translocation, or other chromosomal rearrangements in one of the parents) with soft marker and those with any combination of two soft markers [4,6]. However, fetus with structural abnormality by ultrasound should be offered diagnostic testing with chromosomal microarray because there is a substantial risk that a chromosomal abnormality other than trisomy 21, 18, and 13 is present in the fetus which will not be detected by NIPT [9].

As soft markers were introduced as markers for aneuploidy in high risk population, there have been efforts for clarification of their significance after normal FTS or NIPT [1,4]. In this low risk population, soft markers were found in 5.9% of fetuses at second trimester ultrasound; markers were isolated in 5.1%, multiple in 0.7%, and combined with anomalies in 0.1% [1]. Most cases (95%) had a single marker, 4% had two markers, and 1% had three or more markers when soft markers were first identified [10]. Diagnostic testing should not be recommended to patients with an isolated soft marker in the setting of a negative NIPT result [9]. Also, looking for soft markers of trisomy 21, should not be performed in women with a normal NIPT result due to its high false-positive rate and poor positive predictive value [11].

Previous studies reported isolated echogenic bowel was associated with an increased risk of congenital anomalies, and preterm birth. Isolated pyelectasis was associated with an increased risk of congenital anomalies of the kidneys or urinary tract. Multiple soft markers were associated with an increased risk of congenital anomalies and preterm birth [3,6,1215]. It is essential to provide information to the parents about the observed soft markers and its potential impact on prenatal and postnatal life. This paper will review recent literatures about the most common second trimester sonographic soft markers and propose a simple clinical guideline for management of specific soft markers in pregnancies (Table 1) [3,6,10,1236].


Fetal VM is defined as a dilatation of the lateral ventricle atrium to a width of 10 mm or more. A measurement of 10–12 mm is commonly referred to as mild VM, while measurement of 12–15 and >15 mm are defined as moderate and severe VM. Its prevalence varies between 0.3 and 1.5 per 1,000 births [16]. VM have been associated with normal variant, aneuploidy, genetic syndromes, primary brain abnormalities, congenital infection such as cytomegalovirus (CMV) and toxoplasma, cerebrovascular accidents and intracranial hemorrhage [1618]. Isolated mild and moderate VM regresses or become stable in diameters contrast to severe VM. In the systematic review and meta-analysis of Scala et al. [16], the fetuses with isolated unilateral VM had 0% chromosomal abnormalities, 8% congenital infection, and in about 5% of fetuses, there is progression of VM during the course of the pregnancy. The prevalence of neurodevelopmental delay in cases of apparently isolated unilateral mild or moderate VM was 6%, and in severe VM it was 7%. High rates of cerebral palsy, seizures and impaired motor capabilities were observed in severe VM [1618]. The prevalence of neurodevelopmental delay in bilateral mild and moderate VM varies between 8% and 12% [19]. Magnetic resonance imaging can be used for further elucidation of cases with ventricular enlargement [18]. The overall prognosis of VM strongly depends on both the extent of enlargement and/or the presence of other abnormal findings or structural malformations. Also, asymmetric pattern of VM is a potential risk factor for anomalies of neuropsychological development [18]. Screening for congenital infection should be part of prenatal workup, especially if VM with increased periventricular echogenicity, calcification, periventricular pseudocysts and intraventricular synechia [37]. Diagnosis of toxoplasma and CMV infection is based on positive specific immunoglobulin M results with confirmatory immunoglobulin G avidity test. In case of a positive result for toxoplasma infection in maternal serum, amniocentesis is performed to determine the presence of the pathogen in the amniotic fluid by amplification of DNA, using polymerase chain reaction [38]. Repeated ultrasound scans to follow VM size or extension of VM are recommended because it is correlated with the prognosis [1619].

Choroid plexus cyst

CPC is a small sonographically discrete fluid-filled space ≥5 mm within the choroid plexus and CPC is seen as black echo-free areas. CPC is found in approximately 2 to 4% of fetuses at 16 to 24 weeks of gestation usually as an isolated finding in otherwise normal low-risk pregnancy [1,20]. CPC typically regresses by 23 weeks regardless of karyotype [13]. There is an association between CPCs and chromosomal defects, particularly trisomy 18. However, the majority of fetuses with trisomy 18 have multiple other defects. Risk of amniocentesis is not justified if CPC is an isolated finding and amniocentesis is only acceptable if other major anomalies are present [6,21]. Women with isolated CPC and negative FTS and NIPT, the finding of CPC may be described as not clinically significant or as a normal variant [9]. CPC is not considered a structural nor functional brain abnormality [4]. Isolated CPCs in fetuses with normal karyotypes do not affect child mental and motor development after birth [22].

Absent or hypoplastic nasal bone

Absent of hypoplastic nasal bone, defined by a nasal bone that is not visible in first trimester or with a length of less than 2.5 mm in the mid-sagittal section of the fetal profile in second trimester, however the nasal bone length appears to be shorter in Korean fetuses than Caucasian and Chinese fetuses and is necessary to refer to race standards [39], and is described as one of the many phenotypic features of Down syndrome [6]. Cicero et al. [23] reported that in 73% of trisomy 21 fetuses, the nasal bone was not visible at the 11–14 week scan. First trimester screening for trisomy 21 based on maternal age and fetal nuchal translucency detects about 70% of affected fetuses for a 3% false positive rate and with additional assessment of nasal bone, the detection rate increases to about 80% with the same false positive rate [40]. It has been estimated that between 0.5 to 2.8% of euploid fetuses will have images consistent with delayed ossification of the nasal bone in either first-or second trimester sonography [23]. The absence of a fetal nasal bone warrants a detailed evaluation of fetal anatomy. If there are no other anomalies and normal karyotype, it is reasonable to reassure that the likelihood of a good neonatal outcome is high. However, case reports have described an absent fetal nasal bone in B-cell immunodeficiency, cri du chat (5p–) syndrome, and partial trisomy 20q. Considering these cases, microarray studies could be performed in addition to a fetal karyotype when an absent fetal nasal bone occurs with additional sonographic anomalies [24].

Thickened nuchal fold

Thickened NF is defines as, thickening of the skin and the subcutaneous tissues on the posterior aspect of the fetal neck measuring 6 mm or greater before 20+6 weeks’ gestation. Its prevalence is 1 to 6 per 1,000 [3]. Bromley et al. [10] concluded in their retrospective study, that especially thickened NF in second trimester is the most important soft marker in the detection of Down syndrome among fetuses who have had normal first trimester sonographic screening for aneuploidy [6]. Therefore, karyotyping should be offered when thickened NF is observed [10]. Controversially, diagnostic testing in setting of a negative NIPT screen with isolated soft marker is not recommended in other guideline [9]. Large randomized controlled trials will be needed in management of thickened NF. Some recent data indicate a positive association between NF measurement and congenital heart defects, with reported adjusted odds ratio of 14.8 (95% confidence interval [CI], 5.4–40.1). One in every 23 pregnancies with a NF measurement ≥5 mm had a congenital heart disease (sensitivity=3.3%, specificity=99.6%). Therefore, a targeted ultrasound with particular attention to the fetal heart is reasonable when a thickened NF is identified after normal fetal karyotyping [25].

Intracardiac echogenic focus

IEF is defined as an echogenic small spot inside the heart having brightness equivalent to that of the bone. Regarding the location, 88% are found in the left ventricle and 5% in right ventricle. They are found in about 3 to 4% of normal fetuses and in about 25% of those with trisomy 21 [6,41]. Isolated IEF are associated with an increased risk of Down syndrome, with likelihood ratios generally ranging from 1.5 to 5.0 [26]. In about 90% of cases they resolve by the third trimester of pregnancy [6]. In low risk populations for aneuploidy, the presence of an IEF is not an indication for invasive procedures and with negative FTS or NIPT it may be described as not clinically significant or as a normal variant. In cases of isolated IEF in euploid fetuses there is no evidence of an altered cardiac function and a detailed echocardiogram is not recommended as long as the second trimester scan is normal [42]. However, a few studies have suggested that diffuse echogenicity in the fetal heart, especially when the right ventricle is also involved, may signal a poor prognosis and deserves a further search for associated pathologies [27,28]. Postnatal cardiac functions after the presence of prenatally diagnosed IEF are not associated with myocardial dysfunction during childhood [41,43].

Echogenic bowel

Echogenic bowel is defined as fetal bowel of similar or greater echogenicity than the surrounding bone or fetal liver. Two-third of them was detected during the first and the second trimesters with the prevalence ranging from 0.2 to 1.8%. Echogenic bowel resolves spontaneously in 19.7% of cases and the association with Down syndrome reported likelihood ratio of 5.5 to 6.7 [13]. Echogenic bowel has been described as normal variant, but may be associated with congenital viral infections (particularly CMV), aneuploidy, intra-amniotic bleeding, severe uteroplacental insufficiency, meconium peritonitis, cystic fibrosis, anemia, and fetal growth restriction (FGR) [3,6,13]. Therefore, a comprehensive examination and evaluation for CMV infection is suggested, in addition to correlation with aneuploidy testing results. Catania et al. [12] reported both pregnancy and neonatal outcomes by the time of echogenic bowel detected. Studies advocate serial fetal growth assessment when isolated echogenic bowel was detected at the first and the second trimester because it is associated with FGR and increase in intrauterine fetal demise (relative risk [RR] 1.6 for FGR and 8.6 for intrauterine fetal demise). If echogenic bowel was detected during the third trimester, the likelihood of postnatal surgical intervention for intestinal anomalies is significantly increased (0.9 to 7%) [12,29]. However, Patel et al. [44] has provided some reassurance that there was no evidence of any serious long term bowel disease associated with isolated fetal echogenic bowel.

Shortened humerus length and femur length

Shortened humerus and femur are defined as bone length below the 5th percentile for gestational age [30]. Shortened humerus length (HL) and femur length (FL) was observed in 0.4 to 3.9% of normal fetus [26]. Fetal short long bones have been associated with aneuploidy, skeletal dysplasia, fetal structural anomalies, preeclampsia, stillbirth and FGR. Trisomy 21, 18, 13 or an unbalanced autosomal structural abnormality are associated with relative short FL (risk 1:123; 95% CI, 79–192) [31]. In the study of Kaijomaa et al. [30], isolated shorted HL and FL in second trimester demonstrated higher rates of preterm delivery and preeclampsia. The possible etiology is not yet fully understood, but it may be of placental origin. Other studies have also reported that isolated short FL was associated with a significantly higher RR for small-for gestational age infants (odds ratio [OR], 4.3–4.4; 95% CI, 3.8–4.8) and early preterm delivery (OR, 4.2; 95% CI, 3.5–4.9) [31,32]. Short HL and FL may be an early sign of placental dysfunction and warrant increased antenatal surveillance with repeated sonography for growth assessment and frequent blood pressure measurements [32].

Fetal pyelectasis

Fetal pyelectasis is defined as an anteroposterior measurement in a transverse scanning plane of 4 mm or larger in second trimester and/or 7 mm or larger in third trimester, whereas pelvic anteroposterior diameter 10 mm or larger is criteria for hydronephorosis [4,45]. The prevalence of pyelectasis varies from 0.1 to 2.4% in low risk populations [1]. While most commonly fetal pyelectasis is a transient physiologic state, it can be a marker for aneuploidy and be a precursor of potential urinary tract pathology [3]. The majority of cases of pyelectasis detected in the second trimester will resolve either before delivery or within the first year of postnatal life [13,15]. Isolated mild pyelectasis in low risk population is not the evidence of increased risk of aneuploidy and therefore it cannot be considered as an indication for the determination of the karyotype [4,15]. A prenatal progression of dilatation of pyelectasis was directly related to a worse outcome [15]. Therefore, a follow-up ultrasound at 32 weeks of gestation to rule out persistent pyelectasis should be performed. At this time, approximately half of cases will be normal, 30% will continue to have mild pyelectasis, and 15% will have more significant hydronephrosis. If the renal pelvis measures >7 mm at 30 week examination, postnatal follow-up is suggested [14,15].

Single umbilical artery

SUA is characterized by absence of one of umbilical arteries and it occurs in 0.5 to 5% of pregnancies. SUA appears to be an isolated finding in 60–80% of cases [4,33,34]. Controversy exists regarding the association between aneuploidy, small for gestational age (SGA), preterm birth and isolated SUA. Some studies have shown a higher risk of SGA, preterm birth, pregnancy-induced hypertension, admission to the neonatal intensive care unit, and perinatal mortality [33,35]. Isolated SUA was associated with a higher rate of cesarean section due to non-reassuring fetal heart rate, SGA, and a higher rate of placenta or umbilical cord abnormalities [35,36]. Controversially, the meta-analysis of Voskamp et al. [34] showed no statistically significant difference in aneuploidy rate, birth weight and incidence of FGR between isolated SUA fetuses and three vessel cord fetuses, and concluded targeted growth assessment should not be a routine practice.


It is important to understand the characteristics of each soft marker to prevent unnecessary karyotyping and to perform necessary karyotyping. With rapid implementation of NIPT as a new method of prenatal testing for Down syndrome or other common aneuploidies in the first trimester, it became easier to deal with soft markers. Diagnostic testing should not be recommended to patients with an isolated soft marker in the setting of a negative NIPT result [9]. Also, looking for soft markers of trisomy 21, should not be performed in women with a normal NIPT result due to its high false-positive rate and poor positive predictive value [11]. However, soft marker screening still remains a tool in screening for non-aneuploidy-related conditions such as, structural anomalies and adverse pregnancy outcomes that requires follow-up during pregnancy. This article proposed a simple clinical summary for management of specific soft markers. Patients with fetus with specific soft markers mentioned above may be reassured that the pregnancy outcomes and the long-term outcomes are generally favorable. Furthermore, more studies are needed to establish standard guidelines and to facilitate the application of soft markers to the clinical practice in Koreans.


Table 1

Proposal of a simple clinical summary for management of specific soft markers in pregnancies

MarkerIncidence (%)ConditionsConsiderations and follow-up
Ventriculomegaly [1619]3.0–15AneuploidyGenetic syndromePrimary brain abnormalitiesCongenital infection (CMV and toxoplasma)Cerebrovascular accidentsIntracranial hemorrhageTORCH screeningFollow-up scans to look for progressionConsider brain magnetic resonance imaging if moderate to severe ventriculomegaly for detection of additional brain abnormalities
Choroid plexus cyst [2022]2–4Aneuploidy (esp. trisomy 18)Detail evaluation for other markers of aneuploidy
Absent or hypoplastic nasal bone [23,24]0.5–2.8Aneuploidy (esp. trisomy 21)B-cell immunodeficiencyCri-du chat syndromePartial trisomy 20qDetailed evaluation of fetal anatomyConsider microarray studies (if with additional sonographic anomalies)
Thickened nuchal fold [10,25]0.4–0.6Down syndromeCongenital heart diseaseEvaluation of fetal heart, consider fetal echocardiography
Intracardiac echogenic focus [2628]3–4Down syndromeDetail evaluation for other markers of aneuploidyMore attention if multiple and right ventricle involved
Echogenic bowel [3,6,12,13,29]0.2–1.8AneuploidyIntrauterine growth restrictionIntrauterine fetal demiseCystic fibrosisCongenital infection (esp. CMV)Gastrointestinal anomalyEvaluation for cystic fibrosisTORCH screening32-week ultrasound to assess for bowel dilatation or obstruction
Shortened humerus and femur length [3032]0.4–3.9AneuploidyStructural abnormalitiesSkeletal dysplasiaPreeclampsiaPreterm deliveryOligohydramniosIntrauterine fetal demiseIntrauterine growth restriction32-week ultrasound to assess growth and to rule out certain skeletal dysplasiaFrequent blood pressure measurementStudy umbilical and uterine artery Doppler flowSurveillance in timing of delivery
Pyelectasis [3,1315]0.1–2.4UPJ obstructionVesicoureteral refluxPosterior urethral valvesUreteral obstructionOther renal abnormalities32-week ultrasound to assess kidneysFollow-up scans to look for progressionPostnatal follow-up if >7 mm
Single umbilical artery [3336]0.5–5ControversialAneuploidySGAPreterm birthIncrease cesarean section rateUndergo targeted anatomical survey (level II ultrasound)Controversial-ultrasound to assess growth

CMV, cytomegalovirus; TORCH, toxoplasmosis, rubella, cytomegalovirus and herpes simplex; UPJ, ureteropelvic junction; SGA, small for gestational age.

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