====== Secondary psoas abscess ======
Secondary [[psoas abscess]]:

endocarditis, femoral artery catheterization, infected abdominal
[[aortic aneurysm]] graft, hepatocellular Ca, intrauterine
contraceptive device, trauma, sepsis, dialysis (peritoneal or
long-term hemodialysis)

It may arise via contiguous spread from adjacent structures or by the hematogenous route from a distant site. The incidence is rare, but the frequency of this diagnosis has increased with the use of computed tomography, prior to which most cases were diagnosed at postmortem
((Mückley T, Schütz T, Kirschner M, et al. Psoas abscess: the spine as a primary source of infection. Spine (Phila Pa 1976) 2003; 28:E106.)).

===1981===
A case is reported of acute [[osteomyelitis]] of the lumbar spine presenting with a [[psoas abscess]] which extended into the [[epidural space]] mimicking an [[epidural abscess]]. The patient also had severe septicaemia and a complete [[cauda equina]] lesion. The septicaemia was controlled by draining the abscess by an anterior approach to the lumbar spine. Decompression of the cord was achieved by removing the sequestrated discs, the necrotic body of the fourth lumbar vertebra and draining the epidural abscess by opening the [[posterior longitudinal ligament]]
((David CV, Balasubramaniam P. Acute osteomyelitis of the spine with paraplegia.
Aust N Z J Surg. 1981 Dec;51(6):544-5. PubMed PMID: 6949552.)).