Background: Morgagni Hernia is an uncommon congenital abnormality usually occurring in right side. This paper introduces it in a 15-month old girl admitted to Shaheed Beheshti Hospital of Kashan University of Medical Sciences. With a very are Lt. Side Hernia.

Results: A 15-month old girl referred with fever and bloody vomiting. Paraclinical studies including X-ray studies of upper GI system revealed Morgagni Hernia. In celiotomy stomach was not found in the abdomen. If had had passed to Lt chest cavity through a defect in anterior part of diaphragm and was entrapped and strangulated there. It was released and returned to the abdomen and fixed. The baby discharged with a good condition.

Conclusion: This Hernia causes repeated lung infections, cough and vomiting, more importantly it may cause strangulation and necrosis of visceral organs and compromise the patients life, so its in time diagnosis is very critical. It is recommended hat whenever there is any abnormality in chest x-ray including air and fluid behind morbidity and mortality.