Chilaiditi sign is an incidental radiologic finding that presents as a crescent lucency below the right diaphragm due to malpositioned loops of the colon or small bowel. It is extremely rare, occurring in 0.025% to 0.28% of the general population. It is usually benign but can lead to various life threatening complications including obstruction, perforation, or ischemia. It is therefore important to recognize this sign and proceed with timely management. An 80 year old male with history significant for diabetes mellitus, atrial fibrillation, and hypertension presented with complaints of intermittent right-sided pleuritic chest pain and productive cough for one week. On presentation, patient was tachycardic, tachypnic, afebrile, normotensive, and on room air. Chest x-ray showed pneumonia, fractures of the right 6th and 7th ribs, and incidentally, presence of gas below the right diaphragm. Due to this alarming finding, patient was reassessed. He reported regular bowel movements without nausea or vomiting, had active bowel sounds, and no signs of acute abdomen. As this finding was inconsistent with the clinical condition, Chilaiditi was considered. CT abdomen confirmed diagnosis of Chilaiditi syndrome with hepatodiaphragmatic interposition of the colon. Patient was discharged on Levofloxacin and pain control for pneumonia and fractures respectively. Incidental findings were appropriately documented to prevent extensive retesting in the future. Our case illustrates the incidental sign of Chilaiditi. It is due to the anterior interposition of the colon to the liver and is a cause of pseudopneumoperitoneum. The absence of pain, nausea, vomiting, and abdominal distention distinguishes Chilaiditi sign from its counterpart, Chilaiditi syndrome. The exact mechanism is unknown but thought to be from a wide space between the liver and the diaphragm. This could be from liver scarring, ascites, diaphragmatic weakness, laxity of ligaments, abnormal colon mobilization, constipation, obesity, or increased intraabdominal pressure. Further imaging must be obtained if Chilaiditi sign is found. If there is evidence of ischemic bowel, volvulus, obstruction, or perforation, surgical treatment should be pursued. Chilaiditi sign occurs in 1 in 50,000 adults and therefore is not widely taught or recognized. Though it is generally benign, it can be a sign of a life-threatening condition. Prompt recognition and early therapy are quintessential to prevent fatal complications.Figure 1
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