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Lethal neonatal mandibuloacral dysplasia

M D Seftel¹, C A Wright, P L Po

¹Department of Human Genetics, School of Pathology, South African Institute for Medical Research, Johannesburg, South Africa.

American Journal of Medical Genetics

|December 2, 1996

Summary

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This study details a lethal neonatal case of mandibuloacral dysplasia, a rare genetic disorder. The severe presentation included unique features like glandular hypospadias, previously undescribed in this condition.

Area of Science:

Medical Genetics
Developmental Biology
Pediatric Pathology

Background:

Mandibuloacral dysplasia (MAD) is a rare autosomal recessive disorder characterized by skeletal abnormalities.
Previous reports primarily describe non-lethal forms with varying severity.
Neonatal lethality in MAD is exceptionally rare, making such cases critical for understanding disease spectrum.

Observation:

A neonate presented with characteristic features of mandibuloacral dysplasia including large fontanelles, sparse hair, pseudo-exophthalmos, micrognathia, and short clavicles.
Bulbar digits were also noted, contributing to the dysmorphic phenotype.
The neonate exhibited glandular hypospadias, a finding not previously documented in mandibuloacral dysplasia.

Findings:

The described case represents a severe, lethal expression of mandibuloacral dysplasia presenting at birth.

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The presence of glandular hypospadias is a novel observation, expanding the known phenotypic spectrum of MAD.

The combination of severe skeletal anomalies and hypospadias suggests a potential link or shared pathway in developmental processes.

Implications:

This case highlights the extreme variability and potential severity of mandibuloacral dysplasia.
The identification of glandular hypospadias may necessitate re-evaluation of genetic counseling and diagnostic criteria for MAD.
Further research into the molecular mechanisms underlying this severe phenotype could provide insights into skeletal and urogenital development.