We report 2 cases of false pneumoperitoneum. The diagnosis was suspect
ed on an upright chest or abdominal plain films. The absence of clinic
al signs and symptoms of peritoneal irradiation suggested a wrong radi
ological diagnosis. Emergency CT scan definitely eliminated a pnuemope
ritoneum and suggested the right diagnosis in both cases. This exam ma
y play the decisive role in preventing needless emergency laparotomy.