Chyle effusion in the pleural cavity is a rare situation. It may be acquired (surgical injuries) or congenital (abnormalities of the lymphatic system). Clinical manüestations are varied and depend on the amount of chyle Ioss (malnutrition, fluid and electrolyte imbalance and immune suppression). This article reports the case of a female newborn infant diagnosed with Ieft diaphragmatic hernia who presented postoperative chylothorax. Medica) management included nutritional support and octreotide. Resolution of chylothorax was obtained with no additional surgical treatment.