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[Nemaline myopathy--a case report]
Insights
This case study details an 8-year-old girl diagnosed with nemaline myopathy, a rare genetic disorder affecting muscle fibers. Early diagnosis and understanding of this condition are crucial for managing pediatric neuromuscular diseases.
Area of Science:
- Pediatric Neurology
- Muscle Diseases
- Genetics
Background:
- Nemaline myopathy is a congenital myopathy characterized by muscle weakness.
- It presents with varying degrees of severity, often impacting motor development.
- Early identification is key for managing symptoms and potential complications.
Observation:
- An 8-year-old girl presented with infantile feeding difficulties and delayed motor milestones (sitting at 1 year, walking at 2 years).
- Physical examination revealed a slender build, below-average height and weight, elongated face, high-arched palate, and proximal muscle weakness with a waddling gait.
- Neurological examination showed intact cranial nerves and sensation.
Findings:
- Standard laboratory tests, nerve conduction velocity (NCV), and echocardiogram were normal.
- Electromyography (EMG) indicated a myopathic pattern.
- Muscle biopsy revealed characteristic nemaline rods and a predominance of type 1 muscle fibers, confirming nemaline myopathy.
Implications:
- This case highlights the diagnostic process for nemaline myopathy in a pediatric patient.
- Accurate diagnosis through EMG and muscle biopsy is essential for appropriate management.
- Understanding the specific muscle fiber characteristics aids in comprehending disease pathophysiology.
Abstract:
An 8-year-old Chinese girl who was noted to have feeding difficulty and poor weight gain since her infancy. Her motor development was delayed with sitting at 1-year-old and walking independently at 2-year-old. She visited our OPD when she was 8. Physically, she was thin and slender. Her height and weight were below the 10th and 3rd percentile. Her face was elongated with high arched palate. Neurologically, she had waddling gate with marked proximal muscle weakness. Her cranial nerves and sensation remained intact. Laboratory tests including blood routine, liver function, renal function, electrolytes, NCV and cardiac echo all were within normal limits. The EMG showed myopathic pattern. A fresh-frozen muscle biopsy stained with the modified Gomori trichrome, processed by histochemistry and electronmicroscopic examination showed typical nemaline rods with predominance of type 1 muscle fibers. She was then diagnosed to have nemaline myopathy.