Key Clinical MessageAbdominal trauma can be one of the causes of chylous ascites in pediatric cases, along with tuberculosis and malignancy. However, a definitive diagnosis is more reasonable to be done by excluding other causes.AbstractChylous ascites (CA) is a rare type of ascites. Though it has high mortality and morbidity rates, which usually happen due to the rupture of lymph vessels into the peritoneal cavity. Congenital abnormalities, including lymphatic hypoplasia or dysplasia, are the most causes in pediatrics. CA following trauma in children is very rare, and to the best of our knowledge, there are very few reports in this regard. Here, we report a 7‐year‐old girl who was referred to our center with CA after a car accident.