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Benign acute myositis in an adult patient
Jean-Baptiste Chanson1, Claude Dakayi2, Béatrice Lannes3
1Neurologie, Hopitaux universitaires de Strasbourg, Strasbourg, France.
Abstract:
The benign acute childhood myositis presents as a marked and painful oedema of leg muscles in the days following a viral illness. This disease is often considered as occurring only in children. We report the case of a 32-year-old patient who presented with severe pain and oedema of both legs associated with motor deficit of lower extremities. He suffered from a grippal syndrome for 4 days. Creatine kinase blood level rose up to 39 394 IU/L (n<200) and a muscle biopsy of left tibialis anterior found necrosisand regeneration of myocytes without inflammatory infiltrates. All clinical and paraclinical abnormalities spontaneously disappeared in a few days. This case illustrates that a disorder similar to benign acute childhood myositis may occur in adult patients. Muscle biopsy might be avoided in typical cases because of the favourable evolution.
Insights
Benign acute childhood myositis, typically seen in children, can affect adults. This viral-induced condition presents with leg pain and swelling, but resolves quickly without intervention.
Area of Science:
- Neurology
- Infectious Diseases
- Musculoskeletal Disorders
Background:
- Benign acute childhood myositis is a transient inflammatory condition affecting leg muscles, commonly observed in pediatric populations following viral infections.
- The condition is characterized by sudden onset of severe leg pain, muscle swelling, and difficulty walking.
Observation:
- A 32-year-old adult presented with acute, severe bilateral leg pain, edema, and motor deficits after a 4-day grippal illness.
- Laboratory tests revealed significantly elevated creatine kinase levels (39,394 IU/L).
- Muscle biopsy of the tibialis anterior showed myocyte necrosis and regeneration without inflammation.
Findings:
- The adult patient's symptoms and laboratory abnormalities resolved spontaneously within days.
- This case demonstrates that a clinical presentation similar to benign acute childhood myositis can occur in adults.
- The findings suggest a post-viral myopathy with a favorable prognosis in adults.
Implications:
- This case expands the known demographic for benign acute childhood myositis-like presentations.
- It suggests that adult patients experiencing similar symptoms may not require invasive muscle biopsies due to the typically benign and self-limiting nature of the condition.
- Further research could explore the specific viral triggers and underlying mechanisms in adult post-viral myopathies.
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