Objective: Congenital myopathies are rare. Through this article, the authors want to present a clinicopathological analysis of 25 new cases.

Methods: The clinical data of patients who were diagnosed with congenital myopathy between 2001 and 2006 was retrieved. Muscle biopsies were processed for H&E staining, enzyme histochemistry, and immunohistochemistry. Biopsies were also processed for ultrastructural analysis.

Results: During a period of 6 years, 1.12% of the muscle biopsies were diagnosed as congenital myopathies. The most common congenital myopathy was central core disease followed by nemaline rod myopathy and multi-mini core disease. Clinically, they have variable features. The final diagnosis was made with the help of enzyme histochemistry and ultrastructural features.

Conclusions: This study emphasizes the importance of enzyme histochemistry and electron microscopic examination in the diagnosis of congenital myopathies especially in the absence of genetic studies.