Hypoplastic nasal bone: A potential marker for facial dysmorphism associated with pathogenic copy number variants on microarray.

Abstract:

OBJECTIVES:To compare the frequency of abnormal genetic diagnoses spanning a period before and after the availability of chromosomal microarray analysis (CMA). We hypothesised that microarray would provide additional clinically relevant information in cases of isolated hypoplastic nasal bone. METHOD:Fetuses with ultrasound-detected hypoplastic nasal bone (absent or <2.5th percentile in length) between 16 and 37 weeks' gestation over a 10-year period were analysed retrospectively. RESULTS:A total of 118 cases of hypoplastic nasal bone met the inclusion criteria. A pathogenic or potentially pathogenic karyotype was detected more frequently in the era where CMA was available (31/60, 52% vs 19/58, 33%). Of these, 25 cases (42%) had common aneuploidies, and six cases (10%) had clinically relevant copy number variants (CNVs). A clinically relevant CNV was detected in two fetuses that presented with isolated hypoplastic nasal bone on initial ultrasound. CONCLUSION:In addition to its known association with trisomy 21, a hypoplastic nasal bone may be an objective marker of facial dysmorphism associated with clinically relevant CNVs. Our results support consideration of invasive testing with microarray for pregnancies in which a hypoplastic nasal bone has been diagnosed on ultrasound irrespective of a low-risk screening result for common chromosomal abnormalities.

journal_name

Prenat Diagn

journal_title

Prenatal diagnosis

authors

Gu YZ,Nisbet DL,Reidy KL,Palma-Dias R

doi

10.1002/pd.5410

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

116-123

issue

2

eissn

0197-3851

issn

1097-0223

journal_volume

39

pub_type

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