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Pleocore disease. Multi-minicore disease and focal loss of cross striations
Abstract:
We report clinical and morphological data on seven patients with a congenital myopathy as well as data concerning five parents. Classical myopathies such as rod disease, centronuclear myopathy or central core disease could be ruled out. Structural abnormalities of intracellular organelles or particulate inclusions were rare and insignificant. The most prominent and constant features were minicores and focal loss of cross striations, associated with a prevalence of type 1 fibres, increasing with the age at time of biopsy. A carrier state could not be defined in the five examined parents neither on clinical nor on morphological grounds. Although our group of patients could not clinically be distinguished from other congenital myopathies, the combination of the lesions allow their individualization as a subgroup of multicore or minicore disease under the already proposed denomination of pleocore disease [Martin and Busch, abstract in Zentralbl Allg Pathol 124:156 (1980)].
Insights
This study identifies a distinct congenital myopathy subgroup, pleocore disease, characterized by minicores and type 1 fiber prevalence. Parents showed no clinical or morphological signs of this specific myopathy.
Area of Science:
- Neurology
- Pathology
- Genetics
Background:
- Congenital myopathies represent a heterogeneous group of inherited neuromuscular disorders.
- Distinguishing between specific congenital myopathy subtypes is crucial for accurate diagnosis and management.
Observation:
- Seven patients with congenital myopathy were analyzed for clinical and morphological data.
- Classical myopathies (rod, centronuclear, central core) were excluded.
- Minimal structural abnormalities were noted in intracellular organelles.
Findings:
- Consistent findings included minicores and focal loss of cross-striations in muscle fibers.
- A prevalence of type 1 fibers was observed, increasing with patient age at biopsy.
- No carrier state was identified in the five examined parents, clinically or morphologically.
Implications:
- The observed combination of lesions supports the individualization of pleocore disease as a distinct subgroup.
- This classification aids in differentiating it from other multicore or minicore diseases.
- Further research into the genetic basis of pleocore disease is warranted.