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.

KEYWORDS : Myositis; Influenza B virus; Child