title: Pyogenic psoas abscess: worldwide variations in etiology.
mesh_terms: D000038:Abscess / Q000453:epidemiology / Q000209:etiology*; D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003906:Developing Countries; D005060:Europe; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D009135:Muscular Diseases / Q000453:epidemiology / Q000209:etiology*; D009656:North America; D013492:Suppuration