Chylothorax is a rare condition caused by obstruction or disruption of the lymphatic branches draining the lower body and gastrointestinal tract. Chylothorax is characterized by the presence of lymphatic fluid with triglycerides and chylomicrons in the pleural cavity. The diagnosis is confirmed, when the level of triglycerides is above 1.24 mmol/l (i.e. 110 mg/dl). Aetiologically, chylothorax can be divided into traumatic or non-traumatic, and this separation is of pathophysiological importance, since the treatment should be individualized aiming at the underlying cause of the condition.