“…Spontaneous or non-traumatic haemothorax is much less common and has a wide variety of causes, the most frequent being neoplasm and anticoagulant use; other causes include vascular rupture, pulmonary infarction, pleural endometriosis, and conditions that alter coagulation, such as haemophilia, thrombocytopenia and anti-platelet therapy (Martinez et al, 1992;Haro Estarriol et al, 2006). Small haemothoraces may be observed in stable patients but severe or unstable cases require surgical intervention.…”