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Neonatal spinal muscular atrophy type 1 with bone fractures and heart defect

Eve Vaidla1, Inga Talvik, Andres Kulla

  • 1Department of Pediatrics, Tartu University, 6 Lunini Street, Tartu 51014, Estonia.

Journal of Child Neurology
|July 5, 2007
PubMed

Insights

This study details a severe spinal muscular atrophy (SMA) case in an infant with fractures and heart defects. Atypical findings highlight the importance of SMN1 gene testing for diagnosing SMA.

Area of Science:

  • Pediatric Neurology
  • Genetics
  • Skeletal Dysplasias

Background:

  • Spinal muscular atrophy (SMA) is a genetic neuromuscular disorder.
  • Early diagnosis is crucial for managing SMA, particularly the severe 5q form.
  • Atypical presentations can complicate diagnosis.

Observation:

  • An infant presented with severe weakness, multiple fractures, osteopenia, and a heart defect requiring mechanical ventilation.
  • Electroneuromyography revealed denervation, and echocardiography showed an atrial septal defect.
  • Muscle biopsy showed fiber hypertrophy/atrophy, and spinal cord examination revealed degenerating neurons.

Findings:

  • DNA analysis confirmed spinal muscular atrophy (SMA) on the third day of life.
  • Histopathology identified degenerating neurons in the ventral horns and mesencephalic red nucleus, a novel finding.
  • Skeletal abnormalities included partly formed cortical bone in the humerus.

Implications:

  • This case underscores the diverse clinical spectrum of spinal muscular atrophy (SMA).
  • Atypical clinical features should not preclude investigation for 5q SMA.
  • Testing the SMN1 gene remains essential for accurate SMA diagnosis.

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