Clinical History
What is the finding in these electron micrographs and what is its clinical association?
A. Ouroboros fiber – necrotizing myopathy
B. Fibrous body – myofibrillar myopathy
C. Ringbindung – myotonic dystrophy
D. Target fiber – neurogenic atrophy
Correct Answer
Ring fiber (also known as Ringbindung)
Ring fibers are a classical finding in myotonic dystrophy but is a may be seen in various chronic myopathies. They may represent a nonspecific feature of muscle fiber regeneration.
Reference
https://neuromuscular.wustl.edu/pathol/ring.htm
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