Related Experiment Videos
A predominantly cervical form of spinal muscular atrophy
F Goutières1, D Bogicevic, J Aicardi
1Département de Pédiatrie, Hôpital des Enfants, Malades, Paris, France.
Insights
This study reports on five children with an atypical form of spinal muscular atrophy (SMA) presenting with early cervical muscle weakness. This rare condition highlights diagnostic challenges and the potential for severe respiratory complications in pediatric neuromuscular disorders.
Area of Science:
- Neurology
- Pediatrics
- Genetics
Background:
- Spinal muscular atrophy (SMA) exhibits clinical heterogeneity, complicating diagnosis, prognosis, and genetic counseling in pediatric cases.
- Classic SMA forms are well-defined, but unusual presentations necessitate further investigation.
Observation:
- Five children presented with an atypical SMA phenotype.
- Key characteristic was early involvement of cervical muscles, with initially mild or absent peripheral muscle weakness.
Findings:
- Three of the five children experienced fatal secondary respiratory muscle involvement between ages two and four.
- The disorder appears to follow a pattern of recessive inheritance.
Implications:
- This atypical SMA presentation underscores the need for broader diagnostic considerations in pediatric neuromuscular diseases.
- Early identification of cervical muscle weakness in infants may indicate a severe SMA variant requiring prompt respiratory support.
- Understanding this rare SMA subtype can improve genetic counseling and management strategies for affected families.
Abstract:
Clinical heterogeneity within the group of spinal muscular atrophies (SMA) in children can pose practical problems of diagnosis, prognosis and genetic counselling. In addition to the classic forms, unusual cases have been described. Five children with an atypical type of SMA are reported, characterised by early involvement of cervical muscles contrasting with initially mild or absent affection of peripheral muscles. Secondary involvement of respiratory muscles was responsible for the death of three children in the second to fourth year. The disorder may be recessively inherited.