Summary
This case report describes a paediatric patient presenting with congenital bilateral chylothorax, growth restriction, psychomotor delay and characteristic facial dysmorphism, subsequently diagnosed with Noonan syndrome. Molecular genetic analysis identified a pathogenic mutation (p.Glu139Asp) in the PTPN11 gene. The report highlights that Noonan syndrome should be considered in the differential diagnosis of congenital chylothorax accompanied by dysmorphic features and normal karyotype.
UK applicability
The findings are applicable to UK paediatric clinical practice insofar as they reinforce diagnostic criteria for rare genetic syndromes; however, as a single case report, the evidence base is limited for influencing clinical guidelines or policy without corroborating studies.
Key measures
Clinical phenotype assessment; karyotype analysis; cerebral MRI findings; PTPN11 gene sequencing; Van der Burgt diagnostic criteria for Noonan syndrome
Outcomes reported
Case report of a 4-year-old female with congenital chylothorax, dysmorphic features, and pulmonary valve stenosis diagnosed with Noonan syndrome; identification of p.Glu139Asp mutation in PTPN11 gene.
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