The myopathic EMG demonstrates fibrillation potentials. The serum CK level will be normal or low normal. The muscle biopsy will demonstrate the<unk>  rods, but as they are less than 1 µm in length they are easily overlooked. The sections must be trichromatically stained and sectioned at a thickness of 2 to 4 µm for effective visualization. Immunostains for myotilin and α-actinin all but clinch the diagnosis. However,<unk>  rods may still be visible post-mortem in neurosarcoidosis, which may remain on the differential. Generally the outcome is grim, with respiratory insufficiency the cause of death.
Sporadic late-onset nemaline myopathy
Hereditary motor and sensory neuropathy with proximal dominance
Acquired non-inflammatory myopathy
Desmin-related myofibrillar myopathy
Myopathy, X-linked, with excessive autophagy
Statin-associated autoimmune myopathy
Lethal arthrogryposis with anterior horn cell disease
Thyrotoxic myopathy