Summary
This case report describes a paediatric patient with congenital chylothorax and dysmorphic phenotype diagnosed with Noonan syndrome, confirmed by PTPN11 gene mutation. The authors emphasise that Noonan syndrome should be considered in the differential diagnosis of neonatal chylothorax with normal karyotype, as genetic syndromes may underlie cases previously classified as idiopathic. The finding illustrates the utility of molecular genetic testing in clarifying syndromic presentations of rare congenital conditions.
UK applicability
The case report is relevant to UK paediatric practice and genetic diagnostic pathways, offering clinicians guidance on recognising syndromic causes of congenital chylothorax. Results may inform screening protocols in UK neonatal units, though applicability depends on adoption of molecular testing protocols in routine clinical care.
Key measures
Clinical phenotype (facial features, short stature, psychomotor delay, pulmonary valve stenosis), chylothorax presentation, karyotype analysis, cerebral magnetic resonance imaging, PTPN11 gene sequencing
Outcomes reported
The study reported a case of a 4-year-old female presenting with congenital bilateral chylothorax, dysmorphic features, and pulmonary valve stenosis, subsequently diagnosed with Noonan syndrome. Molecular genetic analysis identified a p.Glu139Asp mutation in PTPN11 gene.
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