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(Science: radiology) aetiology, iatrogenic, surgery, dialysis, spontaneous, peptic perforation, bowel obstruction, toxic megacolon, trauma, penetrating or blunt injury, miscellaneous, female genital tract (intercourse, douching, insufflation), pneumatosis intestinalis or coli duration, typically 4-5 days (up to 4 weeks), persists longer in adults than kids, and in thin people x-ray, upright chest or left lateral decubitus can detect 1 cc, gas under diaphragm or lateral liver margin, football sign, rigler sign