Primary psoas abscess: case report and review of the literature.

A case of primary non-tuberculous psoas abscess is reported and the literature reviewed. The aetiology of psoas abscess is varied and there is a worldwide variation in the aetiology. Primary psoas abscess is due to Staphylococcal infection. The pathophysiology, clinical features, diagnosis and treatment are discussed with emphasis on the changing pattern in the aetiology and diagnosis.