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Purpose: Our aim was to evaluate the association of cystic hygroma (CH) with fetal malformations and also to investigate the outcome of fetuses with CH diagnosed in the prenatal period.
Methods: We divided the CH patients into two main groups as isolated CH or CH associated with the congenital structural abnormality (CSA) by measuring the thickness...
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Context 1
... patients with CH less than 6 mm were also associated with abnormal karyotypes in two cases (2/6, 33%) and CSA in three patients (3/10, 30%) and one of these patients had both these findings concurrently. The features of CH- CSA patients are summarized in Table 1. The outcomes of isolated CH patients are documented in Table 2. ...
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Introduction: To identify the prevalence and types of fetal chromosomal polymorphisms in pregnant women and to examine possible associations with screening test parameters.
Materials and methods: Fetal chromosomal polymorphism rate was investigated in pregnant women who had been implemented for invasive prenatal test in a tertiary reference center...
Citations
... however, other studies have found no differences in terms of prognosis when evaluating these variables (10,12). ...
Introduction: Cystic hygroma (CH) is a rare congenital anomaly of the lymphatic system. It is characterized by cystic lesions predominantly in the fetal neck and its prenatal diagnosis has been associated with increased perinatal mortality, aneuploidy, and congenital malformations. Case presentation: Two cases of cervical cystic hygroma diagnosed during the second trimester of gestation are presented, one of them associated with bilateral clubfoot. Both fetuses underwent karyotyping by amniocentesis, which established that both were euploid (46 XY and 46 XX), as well as fetal nuclear magnetic resonance imaging that showed no associated major malformations. In the interdisciplinary follow-up performed 1 year after birth, no findings consistent with genetic syndromes or neurodevelopmental alterations were observed in either of the 2 cases. Conclusions: CH is a marker of poor fetal prognosis; however, euploid fetuses with this condition have a better prognosis if their lesion resolves, do not progress to hydrops fetalis, and do not present other associated malformations. Euploid fetuses with CH require specific genetic studies for RASopathies, such as Noonan syndrome, which were not available in the clinical approach of the 2 cases presented; however, typical postnatal characteristics of the disease were not evident in the clinical genetic evaluation.
... Generalized edema and hydrops may be the reason of left atrium dysfunction and aorta due to compression effect leading to fetal death. In literature, only a few studies have been reported that resolution of hydrops and healthy newborns (11); majority of the studies demonstrate that hydrops is associated with poor fetal outcomes (6,10,12,13). On the other hand, resolution of the nuchal edema with a normal karyotype is a good prognostic marker in the absence of any coexisting malformation. ...
Objective:
To evaluate the obstetric outcomes of fetuses with cystic hygroma other than karyotype abnormalities and structural malformations.
Material and methods:
We conducted a retrospective study based on the review of medical records of pregnant women in whom ultrasonographic diagnosis of fetal cystic hygroma was established in the first trimester from January 2014 to October 2018. All patients were offered genetic counselling and prenatal invasive diagnostic procedures to obtain fetal karyotype. For ongoing pregnancies fetal echocardiography and detailed second trimester sonographic anomaly screening was performed by a perinatologist/pediatric cardiologist. Demographic characteristics of the women and results of the karyotype analysis were obtained from the database of our hospital and correlated with the obstetric outcome.
Results:
Within five-year period, there were 106 cases of fetal cystic hygroma. Of those, fetal cardiac malformations were detected in 4 and migrognathia in one. 85 women underwent fetal invasive procedures and in 52 of the cases, karyotype abnormalities were detected. Fetal outcomes of 33 cases with normal karyotype and 21 cases in whom karyotyping analysis were not performed due to patient refusal were enrolled into the study. Obstetric outcomes of 21 women who refused karyotyping consisted of 13 livebirths, 7 missed abortions and one fetal death, whereas those of 33 women with normal karyotype were; 12 livebirths, 12 missed abortions, 2 hydrops fetalis and 5 fetal deaths. 19 of 33 fetuses with normal karyotype and 8 of 21 fetuses in whom karyotyping were not performed were terminated.
Conclusion:
The presence of cystic hygroma carries a high risk for fetal karyotype abnormalities and cardiac malformations. Postnatal outcomes of the fetuses with cystic hygroma appeared to be correlated with the absence of structural malformations and karyotype abnormalities.
Fetal cystic hygroma (CH) is associated with poor prognosis and chromosomal anomalies. Recent studies have suggested that the genetic background of affected fetuses is essential for predicting pregnancy outcomes. However, the detection performance of different genetic approaches for the etiological diagnosis of fetal CH remains unclear. In this study, we aimed to compare the diagnostic efficiency of karyotyping and chromosomal microarray analysis (CMA) in a local fetal CH cohort, and tried to propose an optimized testing strategy that may help improve the cost-effectiveness of disease management. We reviewed all pregnancies that underwent invasive prenatal diagnosis between January 2017 and September 2021 at one of the largest prenatal diagnostic centers in Southeast China. We collected cases identified by the presence of fetal CH. Prenatal phenotypes and laboratory records of these patients were audited, collated, and analyzed. The detection rates of karyotyping and CMA were compared, and the concordance rate of these two methods was calculated. A total of 157 fetal CH cases were screened from 6,059 patients who underwent prenatal diagnosis. Diagnostic genetic variants were identified in 44.6% (70/157) of the cases. Karyotyping, CMA, and whole-exome sequencing (WES) identified pathogenic genetic variants in 63, 68, and 1 case, respectively. The Cohen’s κ coefficient between karyotyping and CMA was 0.96, with a concordance of 98.0%. Of the 18 cases in which cryptic copy number variants <5 Mb were detected by CMA, 17 were interpreted as variants of uncertain significance, and the remaining cases were interpreted as pathogenic. Trio exome sequencing revealed a pathogenic homozygous splice site mutation in the PIGN gene in a case undiagnosed by CMA and karyotyping. Our study demonstrated that chromosomal aneuploidy abnormalities are the main genetic cause of fetal CH. Based on this, we recommend karyotyping combined with rapid aneuploidy detection as a first-tier approach for the genetic diagnosis of fetal CH. WES and CMA could improve the diagnostic yield when routine genetic tests fail to determine the cause of fetal CH.
Fetal Nuchal fluid collections can manifest with two distinct presentations attributable to the same phenotypic spectrum: increased nuchal translucency (iNT) and cystic hygroma. The prenatal detection of these findings should prompt an accurate assessment through genetic counseling and testing, including karyotype, chromosomal microarray analysis (CMA) and multigene RASopathy panel. We performed a systematic review of the literature and meta-analysis, to calculate diagnostic yields of genetic testing in fetuses with iNT and cystic hygroma. We compared the results with a cohort of 96 fetuses with these isolated findings. Fetuses with isolated NT ≥ 2.5 mm showed karyotype anomalies in 22.76% of cases and CMA presented an incremental detection rate of 2.35%. Fetuses with isolated NT ≥ 3 mm presented aneuploidies in 14.36% of cases and CMA had an incremental detection rate of 3.89%. When the isolated NT measured at least 3.5 mm the diagnostic yield of karyotyping was 34.35%, the incremental CMA detection rate was 4.1%, the incremental diagnostic rate of the RASopathy panel was 1.44% and it was 2.44% for exome sequencing. Interestingly, CMA presents a considerable diagnostic yield in the group of fetuses with NT ≥ 3.5 mm. Similarly, exome sequencing appears to show promising results and could be considered after a negative CMA result.
Background:
Cystic hygroma (CH) is a relatively common observation in prenatal ultrasounds; however, there are few studies about copy number variations (CNVs) of fetuses with CH.
Methods:
We performed a retrospective analysis on 40 pregnant patients (out of 8000 pregnant patients) whose fetuses had CH from November 2016 to June 2021. Villus, amniotic fluid, or umbilical cord blood samples were collected, based on the corresponding gestational age, for karyotype analysis and single-nucleotide polymorphism array (SNP-array).
Results:
Among the 40 fetuses with CH, 16 (40.0%, 16/40) exhibited isolated CH and 24 (60.0%, 24/40) exhibited CH combined with other ultrasound abnormalities. The most common CH-comorbid ultrasound abnormalities observed in this study were congenital heart disease (25.0%, 6/24), thickened nuchal translucency (20.8%, 5/24), and fetal edema (12.5%, 3/24). Karyotype and SNP-array analysis resulted in an overall detection rate of 30.0% (12/40). Karyotype analysis led to the detection of eight cases of pathogenic CNVs, among which 45, X was the most common. In addition to the above pathogenic CNV, four additional cases were detected by SNP-array. There was no significant difference in the observed pathogenic CNVs between isolated CH and CH combined with other ultrasound (31.3% vs 29.2%, P > .99). Karyotype analysis and SNP-array results influence whether parents terminate the pregnancy. When genetic abnormalities are detected in the fetus, the parents often choose to terminate the pregnancy.
Conclusions:
Our study emphasizes that genomic examination should be performed on fetuses with CH to confirm the etiology as soon as possible. During genetic counseling, all fetal characteristics should be carefully and comprehensively evaluated.
The cystic hygroma is the malformation of the lymphatic system that is most frequently observed in the prenatal period and is located mainly in the neck and/or the nape of the neck. Its detection rate has increased since the implementation of fetal nuchal translucency (NT) in the first trimester of pregnancy and its presence has been associated with congenital abnormalities, aneuploidies, pregnancy loss, and developmental disorders. The aim of this case is to highlight the importance of antenatal diagnosis of cystic hygroma in order to perform early intervention and avoid fetal death. It is received, for anatomopathological study, a fetus of undetermined sex product of the first pregnancy of a 19 year-old mother without previous prenatal controls, with the presence of a large cystic mass that extends from the face to the neck. The histological study confirms the diagnosis of cystic hygroma. As there was no karyotype analysis, it was not possible to establish the preexistence of any genetic abnormality. Also known as cystic lymphangioma, is a benign vascular tumor whose antenatal diagnosis by ultrasonography is essential in the evolution and prognosis of the disease. Unfortunately in our case, the lack of prenatal controls and the absence of ultrasonographic studies that would allow knowing the characteristics of this lymphangioma, could significantly impact in the fatal outcome. Key words: lymphangioma; prenatal diagnosis; fetal nuchal translucency.
