abscess Psoas abscess Sirarat Sarntivijai ICD10:K68.12 SNOMEDCT:266463007 MedDRA:10056517 ICD9:567.31 MESH:D016659 iliopsoas abscess Abscess of the PSOAS MUSCLES resulting usually from disease of the lumbar vertebrae, with the pus descending into the muscle sheath. The infection is most commonly tuberculous or staphylococcal. Psoas muscle abscess