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Psoas abscess: thirty-four years after pyogenic osteomyelitis of the spine.

Although purulent sequelae are common with pyogenic spinal osteomyelitis, they should not persist as chronic problems unless they are untreated or treated inadequately. In 1943 a man had a spinal fusion for spondylolisthesis and postoperatively had pyogenic osteomyelitis of the spine, a complication that cleared after three years of treatment. Thirty-four years later, and after 30 years of being free of symptoms, the patient had a psoas abscess that was relieved by surgical intervention.