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Congenital fibre type disproportion
Clinical Neurology and Neurosurgery
|January 1, 1981
Insights
Congenital fibre type disproportion in children shows smaller type 1 muscle fibres compared to type 11. Biopsies suggest spinal abnormalities may underlie these observed muscle fibre differences.
Area of Science:
- Neurology
- Muscle Physiology
- Pediatric Diseases
Background:
- Congenital fibre type disproportion (CFD) is a rare neuromuscular disorder characterized by hypotonicity and muscle weakness.
- The condition presents with distinct muscle fibre size abnormalities, primarily affecting type 1 and type 11 fibres.
Observation:
- This study describes four pediatric patients diagnosed with congenital fibre type disproportion.
- Muscle biopsies revealed that type 1 muscle fibres were significantly smaller (at least 12%) than type 11 fibres in all patients.
- Neuromuscular junction assessment showed no increase in terminal innervation ratio (TIR), but one patient exhibited a reduced number of terminal knobs.
Findings:
- The primary finding is the consistent observation of smaller type 1 fibres relative to type 11 fibres in children with CFD.
- Analysis of fibre type distribution in one case suggested a potential link between spinal abnormalities and the observed muscle pathology.
- The absence of TIR increase alongside decreased terminal knobs may indicate specific denervation patterns.
Implications:
- These findings contribute to understanding the pathophysiology of congenital fibre type disproportion.
- The potential link to spinal issues highlights the importance of comprehensive neurological evaluation in affected children.
- Further research into the neurogenic or myogenic origins of CFD is warranted based on these observations.
Abstract:
Four children with congenital fibre type disproportion were described. It was shown that their type 1 fibres were at least 12% smaller than the type 11 fibres. There was no increase in the terminal innervation ratio (TIR), but a decreased number of terminal knobs was observed in the biopsy of one child. The distribution of fibre types in the biopsy of another child bears out the notion that the abnormalities as seen in the biopsy can be traced back to the spine.