Influenza B virus infections appear to be more common extra-
respiratory tract symptoms, compared to
influenza A virus infections. Benign acute childhood
myositis (BACM) is a benign
disease that is caused mainly by many
viruses like influenza A or
B virus infection. Usually BACM is fully cured with only supportive
treatment without unnecessary investigation or invasive
procedure. This
report describes an eight-year-old boy with acute bilateral calf
pain and
walking difficulty
who diagnosed with BACM after
influenza B virus infection.