In trauma cases, blunt trauma abdomen  may be associated with head injury. Patient may die due to intra- bdominal bleeding. There may be minute diaphragmatic tear that may be undetected in USG. In absence of pneumo-thorax patient may develop life threatening pleural effusion (non- pathological) due to pressure gradient between intra - abdominal cavity & pleural cavity. The lung collapse may develop due to pleural effusion.During conservative management of cases of blunt trauma abdomen, patient may succumb due to such type of complication. Timely inter-vention either by inter-costal drainage & under water seal technique or surgical exploration of abdomen & repair of diaphragmatic tear is important to save life of patient. In the present case, patient was survived by timely inter costal drainage tubing with under water seal.