Down syndrome with co-occurring Marfan syndrome

Area of Science:

• Genetics
• Pediatrics
• Syndromology

Background:

• Down syndrome (DS) and Marfan syndrome (MFS) are distinct genetic disorders with minimal reported phenotypic overlap.
• Co-occurrence of DS and MFS is rare, presenting unique clinical challenges due to variable feature expression.

Observation:

• Presents the first reported adolescent case of co-occurring trisomy 21 (DS) and fibrillin-1 gene-associated MFS.
• The patient exhibited a height at the 90th percentile for an 11-year-old boy, indicating potential growth implications.

Findings:

• The co-occurrence of DS and MFS can lead to mixed or dominant expressions of features from both syndromes.
• Clinicians must recognize features of the 'non-dominating' syndrome for accurate diagnosis and management.

Implications:

• Highlights the need for comprehensive medical care strategies when DS and MFS are present concurrently.
• Recommends close monitoring of cardiovascular, ophthalmologic, and musculoskeletal systems due to independent risks associated with each syndrome.