Air Under the Diaphragm? When It's NOT an Emergency
"Discover the rare Chilaiditi syndrome, a condition that mimics a surgical emergency but often requires only supportive care."
When doctors spot air under the diaphragm in an X-ray, it's usually a red alert, suggesting a potentially life-threatening situation that needs immediate surgery. However, there are exceptions. This article will shed light on a rare condition known as Chilaiditi syndrome, a diagnostic surprise that every healthcare professional should be aware of.
Chilaiditi sign, the hallmark of this syndrome, is a radiologic finding where a portion of the colon slips between the liver and the diaphragm. In most instances, it’s discovered incidentally during imaging for other reasons. Yet, some patients experience symptoms, transforming the sign into Chilaiditi syndrome. This article aims to increase familiarity with Chilaiditi syndrome, emphasize the importance of a thorough physical examination, and appropriate use of radiological tests when evaluating patients.
This article uses a case report of a 49-year-old Egyptian man who presented to the emergency department with cough and abdominal discomfort. His case, diagnosed as Chilaiditi syndrome, highlights the importance of considering this rare condition to avoid unnecessary invasive procedures.
A Rare Finding That Can Resemble an Emergency
Chilaiditi sign is the radiologic finding of bowel—usually the colon—positioned between the liver and the right hemidiaphragm; the term Chilaiditi syndrome applies when related clinical symptoms are present. One 2018 report gives the sign’s worldwide incidence as 0.025–0.28% and a male-to-female ratio of 4:1. It can resemble pneumoperitoneum, an important emergency-department finding, so clinicians distinguish the two using the patient’s presentation and laboratory data. For symptomatic Chilaiditi syndrome, reported initial management includes fluids, nasogastric decompression, bed rest, stool softeners, and enemas, followed by repeat imaging to assess whether the subdiaphragmatic air resolves.
The Case: Cough, Discomfort, and a Surprising X-Ray
A 49-year-old Egyptian man went to the emergency department with a 48-hour history of coughing, producing a small amount of sputum, which was causing abdominal discomfort. While he reported fatigue, he denied other symptoms such as chest pain, fever, or gastrointestinal issues. He had a history of obesity and had undergone a laparoscopic Roux-en-Y gastric bypass for weight loss, but otherwise, his medical history was unremarkable.
- The Twist: Further investigation with a CT scan revealed that the 'air' was actually a loop of colon positioned between the liver and diaphragm, confirming Chilaiditi sign.
- The Diagnosis: Based on the radiologic findings and the patient’s symptoms, a diagnosis of Chilaiditi syndrome was made.
- The Treatment: Instead of surgery, the patient was treated with IV fluids, cough suppressants, and pain management. His pain subsided, and he was discharged in stable condition. A year later, he remained asymptomatic.
Case Reports and Imaging Criteria
A report on two cases describes a 35-year-old woman who presented to the emergency ward with abdominal pain and a 67-year-old man who complained of shortness of breath. A separate review describes three radiological criteria for Chilaiditi sign: the right hemidiaphragm is elevated above the liver by intestine, air distends the bowel to create a pseudopneumoperitoneum appearance, and the liver’s superior margin lies below the level of the left hemidiaphragm. A 2024 case report involving a patient with COPD notes that CT is useful for identifying the abnormal colonic position, while plain X-rays may show colonic air beneath the diaphragm.
When the First Impression Is Misleading
A case report describes initial chest X-ray findings that suggested pneumoperitoneum, while a subsequent contrast-enhanced abdominal CT showed the right colon between the liver and diaphragm, characteristic of Chilaiditi sign. The patient had abdominal pain and diarrhea, symptoms the report associated with Chilaiditi syndrome. Another report says that, at one-year follow-up, a patient remained asymptomatic with no acute complaints and needed no further workup or intervention. These cases illustrate why an alarming initial image may require further diagnostic assessment and why the course can be uneventful in some patients.
Chilaiditi Sign Versus Pneumoperitoneum
Chilaiditi sign is the radiological appearance of bowel interposed between the diaphragm and liver, which can mimic pneumoperitoneum on imaging. Chilaiditi syndrome refers to cases in which the sign is accompanied by gastrointestinal symptoms. The 2024 case report notes that the syndrome is often confused with more serious conditions, while a 2021 article frames the distinction as a diagnostic dilemma. The key distinction in these sources is between an imaging finding that resembles free air and the symptomatic condition associated with the interposed bowel.
Treat the Patient, Not Just the Image
Medical training emphasizes that air under the diaphragm often necessitates immediate surgical intervention. While this remains a crucial principle, this case underscores the need to correlate radiological findings with a comprehensive clinical assessment.
Symptoms Define the Syndrome
Chilaiditi sign describes the radiological finding of large intestine positioned between the diaphragm and liver. When a patient becomes symptomatic, the condition is called Chilaiditi syndrome. The cited case report places this distinction in the context of emergency care, where pneumoperitoneum is an important sign in determining the urgency of management. Thus, the imaging finding and the symptomatic syndrome are related but distinct terms.
A Rare Finding in Emergency Assessment
Pneumoperitoneum is an important diagnostic sign because it can determine the urgency of management in an emergency department. Chilaiditi sign is a rare radiologic finding in which large intestine lies between the diaphragm and liver. This overlap in appearance creates a diagnostic challenge when the finding is being assessed. The source also distinguishes Chilaiditi syndrome as the term used when the patient becomes symptomatic.
A thorough physical examination, devoid of peritonitis signs, warrants further investigation to understand the underlying pathology. By considering conditions like Chilaiditi syndrome, physicians can avoid exposing patients to unnecessary surgeries and their associated risks.
Physicians should broaden their awareness regarding potential causes of pneumoperitoneum that might not require surgical intervention. This can help prevent unnecessary surgeries, thus reducing patient risk and optimizing healthcare resource allocation.