The ultrasonic evaluation of psoas abscess (tropical pyomyositis) in children.

Psoas abscesses in children are not rare in tropical and sub-tropical countries and are related to staphylococcus aureus infection and poor socio-economic conditions. The condition should be considered in all children with the triad of pyrexia, flank pain and hip symptoms. Ultrasound is a readily available and definitive examination. Sonography was used in a series of 45 patients. The findings are discussed and two representative cases presented.