May Be Caused by

 Common

Abscess

Colovesical fistula

Emphysematous cystitis

Endometritis

Perforated appendix

Perforated colonic diverticulum

Pneumatosis cystoides of sigmoid colon

Recent instrumentation

Rectal fistula

Rectal laceration

 Uncommon

Cervical carcinoma with intestinal fistula

Emphysematous vaginitis

Endometrial carcinoma with intestinal fistula

Fetal demise

Giant colonic diverticulum

Hydrogen peroxide enema

Infected uterine fibroid

Intestinal necrosis

Ovarian abscess

Pyometra