Non-invasive diagnosis of pyomyositis.

Two children, aged 6 and 8 years, were admitted to the hospital because of fever, pain, and tenderness over the muscular masses of the thigh and calf, respectively. The presumptive diagnosis of pyomyositis was confirmed by ultrasound studies. Antibiotic treatment was administered in both cases while one child also required surgical drainage of the muscular suppuration. Complete recovery was achieved in both cases. Performance of ultrasound studies is indicated whenever pyomyositis is suspected.