Rigler's sign is suggestive of -: (A) Pneumothorax, (B) Pneumoperitoneum, (C) Peritonitis, (D) Hemothorax
Answer is B. Ans. is 'b' i.e., Pneumoperitoneum Rigler's Signo Both sides of bowel become visible because of free gas on an abdominal xray. This is known as Rigler's Sign.