Genetic causes of macroglossia: diagnostic approach

Area of Science:

• Pediatric Endocrinology
• Clinical Genetics
• Diagnostic Imaging

Background:

• Macroglossia is a significant clinical finding in children.
• Beckwith-Wiedemann syndrome (BWS) is a common overgrowth disorder often presenting with macroglossia.
• Clinical features alone can make differentiating isolated macroglossia from BWS challenging.

Purpose of the Study:

• To evaluate the diagnostic utility of standard tests for macroglossia.
• To assess the contribution of diagnostic tests when clinical features are not suggestive of BWS.
• To refine the diagnostic strategy for pediatric macroglossia.

Main Methods:

• Retrospective analysis of clinical, laboratory, and imaging data.
• Inclusion of children with macroglossia treated at a major children's hospital (1997-2010).
• Classification of patients into isolated macroglossia, provisional BWS, and syndromic groups.

Main Results:

• Beckwith-Wiedemann syndrome (BWS) was the most frequent diagnosis (39/84) in children with macroglossia.
• Six of 24 patients with apparently isolated macroglossia showed abnormal BWS molecular tests.
• A specific diagnosis other than BWS was identified in 42% of cases (35/84).

Conclusions:

• Clinical assessment alone is insufficient to distinguish isolated macroglossia from BWS.
• Recommend initial evaluation with abdominal ultrasounds and BWS molecular studies for all macroglossia cases.
• BWS is a leading cause of macroglossia, even without additional clinical indicators.