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[Sporadic Z disk myopathy with accumulation of rods and cytoplasmic bodies]
J M Gérard1, N Telerman-Toppet, S Borenstein
1Service de Neurologie et d'Anatomo-Pathologie, Hôpital Erasme, Bruxelles.
Abstract:
An unusual myopathy with extensive myofibrillar degeneration related to the Z disk is reported. Focal Z disk disappearance, accumulation of numerous rods and cytoplasmic bodies and some rimmed vacuoles represented the major pathologic features of this sporadic muscular disorder, sharing common clinical and electrophysiological features with inclusion body myositis. This diagnosis was excluded because all nuclei appeared normal and 15-18 nm filaments were not observed in cytoplasm or in the vicinity of membranous whorls. Intramuscular innervation was studied by vital staining with methylene blue: the terminal innervation ratio was normal, indicating a myopathic disorder. The relationship between the present disorder and cytoplasmic bodies and nemaline myopathies is discussed.
Insights
This study reports a rare myopathy featuring Z disk damage, cytoplasmic bodies, and rimmed vacuoles. The disorder presents similarly to inclusion body myositis but lacks its characteristic nuclear abnormalities.
Area of Science:
- Neurology
- Pathology
- Muscle Biology
Background:
- Describes a sporadic muscular disorder with unique pathological features.
- Highlights clinical and electrophysiological similarities to inclusion body myositis.
Observation:
- Characterized by extensive myofibrillar degeneration linked to the Z disk.
- Key features include focal Z disk loss, cytoplasmic bodies, and rimmed vacuoles.
- Normal nuclei and absence of specific filaments excluded inclusion body myositis.
Findings:
- Intramuscular innervation analysis revealed a normal terminal innervation ratio, confirming a myopathic process.
- The observed pathology involves significant Z disk abnormalities and protein aggregates.
Implications:
- Suggests a distinct myopathic entity potentially related to cytoplasmic body or nemaline myopathies.
- Further research is needed to clarify the relationship and underlying mechanisms of this myopathy.