A 6-month-old boy was admitted to the emergency department for "persistent abnormal sounds in the chest." The patient was delivered vaginally after a full-term pregnancy, with a birth weight of 3740 g and normal Apgar scores. The mother reported thoracic rumblings and a recurring cough without signs of respiratory infection. The baby was brought to a cardiologist who noticed muffled heart beats, strange bowel sounds in the anterior chest, and experienced the inability to perform an echocardiogram because of an air barrier. On examination the weight was 6235 g, heart rate 120/min, respiratory rate 44/min, and oxygen saturation 98%. Heart sounds were rhythmic but muffled, some end-expiratory wheezing, and rales were detected in the right hemithorax. The chest radiograph showed a massive diaphragmatic hernia located predominantly in the anterior chest (Figure 1). The patient underwent surgical treatment with a laparoscopic approach: there was a wide anterior diaphragmatic defect with the whole small intestine, the colon, and part of the left lobe of the liver herniated in the thorax. The viscera were reduced in the abdomen and the diaphragmatic dome was reconstructed by identification and sculpting of the diaphragmatic margins, well represented on the left and rear edge, but thin in the right portion, and absent in the THE JOURNAL OF PEDIATRICS www.jpeds.com Volume 169