Histopathology of<unk>  muscle<unk> e<unk>  showing predominance of<unk>  1<unk> es which appear to be atrophic (yellow arrows) and few<unk>  2<unk> es. ATPase staining (pH 4) of a muscle biopsy.<unk>  <unk>  is an inherited form of myopathy with small<unk>  1 muscle<unk> s that may occur in a number of neurological disorders. It has a relatively good outcome and follows a stable course. While the exact genetics is unclear, there is an association with mutations in the genes TPM3, ACTA1 and SEPN1. It is a rare condition.
Congenital fiber type disproportion
Dorsal intercalated segment instability
Progressive cardiac conduction defect
Undifferentiated connective tissue disease
Mendelian susceptibility to mycobacterial disease
Electromagnetic hypersensitivity
Connective tissue disease
Connective tissue neoplasm