Bullae are thinwalled air-containing space within the lung parenchyma. They are usually larger than 1 cm in diameter, and their walls are composed of attenuated and compressed lung parenchyma. (1) Presence of bulla in a background of smoking is usually attributed to chronic obstructive pulmonary disease and is termed bullous emphysema. Bullous lung disease is presence of bulla in an otherwise normal lung. We present a case of bullous lung disease in a sixty five year old man with a clinical presentation of pneumothorax. The confounding factor was presence of smoking. The diagnosis was established by high resolution computed tomography(HRCT) of the chest.