1. The psoas signs. Well-described but forgotten physical examination findings of iliopsoas inflammation;Wong;North Carolina Medical Journal,1993
2. Acute non-tuberculous psoas abscess;Hardcastle;British Journal of Surgery,1970
3. Retroperitoneal abscess;Altemeier;Archives of Surgery (Chicago),1961
4. Retroperitoneal space abscesses;Stevenson;Surgical Gynaecology and Obstetrics,1969
5. Diagnostic value of the psoas shadow;Elkin;Clinical Radiology,1962