<P> Pleural effusion involving fibrinous exudates in the fluid may be called fibrinous pleurisy . It sometimes occurs as a later stage of pleurisy . </P> <P> A person can develop a pleural effusion in the absence of pleurisy . For example, pneumonia, heart failure, cancer, or a pulmonary embolism can lead to a pleural effusion . </P> <P> Air or gas also can build up in the pleural space . This is called a pneumothorax . It can result from acute lung injury or a lung disease like emphysema . Lung procedures, like surgery, drainage of fluid with a needle, examination of the lung from the inside with a light and a camera, or mechanical ventilation, also can cause a pneumothorax . </P> <P> The most common symptom is sudden pain in one side of the lung and shortness of breath . A pneumothorax also can put pressure on the lung and cause it to collapse . </P>

Sharp pain in right side of back when breathing