[Acute transient myositis after influenza]

Area of Science:

• Neurology
• Infectious Diseases
• Pediatrics

Context:

• Influenza recovery can present with characteristic clinical features distinct from other muscle disorders.
• Acute bilateral lower-limb myositis is a rare but identifiable condition following a flu-like illness.
• Understanding this specific myositis aids in differential diagnosis in pediatric cases.

Purpose:

• To describe the clinical presentation, biological findings, and outcomes of acute myositis in children post-influenza.
• To emphasize the importance of recognizing this condition in children with leg pain during influenza season.
• To differentiate this specific myositis from other muscle-affecting diseases.

Summary:

• Five cases of acute bilateral lower-limb myositis in children recovering from influenza are presented.
• Patients experienced severe leg pain and difficulty walking, with abnormal serum creatine phosphokinase (CPK) and serum glutamic-oxaloacetic transaminase (SGOT) levels.
• Virological studies were negative, and the pathogenic mechanism remains unknown, but the condition is transient with complete recovery.

Impact:

• Facilitates earlier and more accurate diagnosis of post-influenza myositis in children.
• Reduces the need for extensive, potentially invasive investigations due to the condition's transient and self-limiting nature.
• Contributes to the medical community's awareness of influenza-associated myositis, improving patient outcomes.