title: The use of ultrasonography in the diagnosis of retroperitoneal abscess caused by perforation of the appendix.
mesh_terms: D000038:Abscess / Q000175:diagnosis* / Q000209:etiology; D000368:Aged; D001064:Appendicitis / Q000150:complications*; D005260:Female; D006801:Humans; D012187:Retroperitoneal Space; D012422:Rupture, Spontaneous; D014463:Ultrasonography