Pneumoperitoneum

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Rigler's Sign
Free Intraperitoneal Gas
Free gas underneath diaphragm
Free gas underneath diaphragm


Rigler's sign (aka double wall sign) is seen when gas is present on both the luminal and peritoneal sides of the bowel, seen here in the right upper quadrant.


Benign Causes

  • Recent surgery
  • Peritoneal hemodialysis