There has been little documentation of emphysematous cystitis. The typical presentation includes lower abdominal pain and hematuria, but some patients may present with septic shock. Because of the severe manifestation of infection around the pelvic cavity, we often confuse this disease with intraabdominal or retroperitoneal abscess. Here in we present two cases from the emergency department. Treatment included aggressive antibiotic therapy and bladder drainage. One patient, a 91 year-old woman, recovered in stable condition. The other, an 80 year-old woman, had an exploratory laparotomy but no pus formation was noted. She was discharged with stabilized vital sign.