Prenatal diagnosis
Audio Summaries

Hypertrophic Cardiomyopathy as a Key Feature of MRAS-Related Noonan Syndrome: New Case and Comprehensive Literature Review

Mar 22, 2026

This study investigates the association between MRAS-related Noonan syndrome and hypertrophic cardiomyopathy (HCM), aiming to highlight the severity of cardiac manifestations linked to MRAS variants. The authors present a new case with severe antenatal features and review existing literature, concluding that pathogenic MRAS variants are strongly correlated with a high risk of HCM. Additionally, they discuss the potential of targeted therapies, such as MEK inhibitors, for treatment.

Twin Reversed Arterial Perfusion (TRAP) Sequence: Proposal for Morphologic Classification System Predicting Natural History

Mar 22, 2026

The authors aimed to establish a new morphological classification system for Twin Reversed Arterial Perfusion (TRAP) sequence based on skeletal characteristics and to evaluate its prognostic implications for expectantly managed cases. They identified five morphological types and found significant differences in survival rates among these types, with better outcomes associated with acardiac twins exhibiting minimal structural development. This classification may enhance prenatal counseling for TRAP cases.

Disparities in Prenatal Carrier Screening Including Partner Testing by Insurance Status

Mar 20, 2026

The authors aimed to investigate whether the implementation and timing of prenatal genetic testing, including partner testing, differ based on insurance payor status. Their retrospective chart review revealed that publicly insured patients experienced delays in prenatal genetic testing and partner testing, as well as lower rates of screening completion, highlighting significant disparities in access to these services. The study underscores the need for strategies to ensure equitable access to timely prenatal genetic testing for all patients.

First-Trimester Down Syndrome Screening in Renal-Transplanted Pregnant Women: Blood Creatinine Levels Impact False-Positive Rate

Mar 19, 2026

This study aimed to evaluate the effectiveness of first-trimester Down syndrome screening in pregnant women who have undergone kidney transplantation and to investigate the influence of renal function, specifically blood creatinine levels, on the screening outcomes. The authors found that while the median values of free-βhCG differed significantly between the transplant group and controls, the screen positive rate was notably higher in the transplant group, indicating that renal function impacts screening results. Overall, the research highlights the need for tailored screening approaches in this unique patient population.

Gene Panel Versus Whole Exome Sequencing for Fetal Anomalies

Mar 13, 2026

The authors aimed to determine whether whole exome sequencing (ES) provides significant advantages over targeted gene panels for identifying genetic causes of fetal anomalies. Their analysis of 109 cases revealed that while ES identified pathogenic variants in 18% of cases, commercial gene panels would have detected 88% of these variants, particularly excelling in isolated skeletal anomalies. The findings suggest that gene panels may be more effective than ES for certain types of fetal anomalies, especially isolated conditions.

Prenatal Deep Phenotyping in Genetic Syndromes Diagnosed in the First Trimester of Pregnancy

Mar 13, 2026

The authors aimed to perform deep phenotyping of fetuses diagnosed with genetic syndromes during the first trimester using standardized HPO terminology. Their study of 293 fetuses revealed that chromosomal disorders were predominant, with polymalformed fetuses showing the highest diagnostic yield. The findings underscore the importance of standardized phenotypic descriptions in enhancing the diagnosis of genetic syndromes and highlight specific anomalies, such as ductus venosus agenesis, that may indicate certain conditions like RASopathies.

Variation in the Genetic Workup of Polyhydramnios: An International and Inter-Specialty Survey

Mar 10, 2026

The authors aimed to assess the variability in the definition and genetic evaluation of polyhydramnios among healthcare professionals across different regions and specialties. Their survey revealed significant differences in the criteria for recommending invasive testing and preferred genetic strategies, influenced by both professional background and geographic location. The findings indicate a lack of standardized practices in the genetic workup of polyhydramnios, highlighting the need for further research to establish evidence-based guidelines.

Low-Pass Genome Sequencing Reveals Associations Between Chromosomal Aberrations and Ultrasonographic Anomalies in a Cohort of 19,452 Fetuses

Mar 7, 2026

This study aimed to assess the detection rates of aneuploidies and pathogenic copy number variations (pCNV) using low-pass genome sequencing in a large cohort of fetuses, particularly focusing on their associations with various ultrasonographic anomalies. The results revealed significant differences in detection rates, with fetal hydrops showing the highest rates for aneuploidies, and identified specific chromosomal aberrations linked to certain anomalies, thereby enhancing the understanding of genetic factors in prenatal diagnosis.

Recurrent Male Hydrops Fetalis Reveals Hidden Incontinentia Pigmenti: Lessons From Pseudogene-Interfered Genomic Diagnosis

Mar 7, 2026

The authors aimed to identify incontinentia pigmenti (IP) as a genetic cause of recurrent non-immune hydrops fetalis (NIHF) in three families, despite negative results from conventional genetic testing. They found that targeted molecular techniques, combined with detailed maternal phenotyping, revealed previously undetected IKBKG gene deletions associated with IP, emphasizing the need for improved prenatal testing strategies in the era of next-generation sequencing.

Diagnostic Yield of Post-Mortem Fetal Micro-CT for Central Nervous System Abnormalities

Mar 7, 2026

This study investigates the effectiveness of post-mortem fetal micro-focus computed tomography (Micro-CT) in detecting central nervous system (CNS) abnormalities in fetuses following pregnancy loss. Analyzing 1200 scans, the authors found that Micro-CT identified 78 CNS abnormalities in 62 fetuses, with neural tube defects and ventriculomegaly being the most common. The findings suggest that Micro-CT is a valuable diagnostic tool for identifying a range of CNS abnormalities, even in cases with significant tissue maceration.