The presence of an abscess in the psoas muscle may be heralded by nonspecific symptomatology, which is often associated with a delay in diagnosis.2,4,8,10,11,13The pattern of pain is usually poorly localized or referred to a distal anatomic ste that does not draw attention to the true source of the pain in the retroperitoneum. The thick fascial sheath of the psoas muscle may contain the infectious process for a prolonged period of time. This case report exemplified these points. The ldquo;classicrdquo; signs and symptoms of the psoas abscess did not occur in this patient until 4 years after her operation. The patient's postoperative complaints of minor low-back pain and cold intolerance in her leg persisted until the psoas abscess abscess was discovered and treated by drainage and hardware removal. This case is presented as an example of a psoas abscess occurring as a latent sequela of anterior spinal fusion with Dwyer instrumentation.
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