When assessing an adult client, the nurse notes that the client has unequal lung expansion. Which conclusion regarding this finding is most likely to be accurate?

A. Chronic Obstructive Pulmonary Disease (COPD) can lead to decreased lung function and abnormalities in lung expansion. However, COPD typically results in a more generalized decrease in lung expansion and breath sounds, rather than pronounced unilateral inequality. While COPD can cause irregularities in lung expansion, it is less likely to cause significant unilateral differences in lung expansion. B. Unequal lung expansion is a key sign of a collapsed lung, or pneumothorax. When a lung collapses, the affected side will show reduced or absent expansion compared to the unaffected side. This is because the collapsed lung cannot expand properly during inhalation, leading to noticeable differences in breath sounds and lung movement on physical examination. C. If the client's lungs were functioning normally, one would expect to observe symmetrical lung expansion. Unequal lung expansion is not a normal finding and usually indicates some form of pathology or abnormality in the lung or thoracic cavity. Normal lung function should result in even expansion of both lungs. D. Chronic lung infections, such as tuberculosis or severe pneumonia, might cause abnormalities in lung sounds or localized lung issues, but they are less likely to cause pronounced unilateral differences in lung expansion. While they can affect lung function, they typically do not cause the same degree of unilateral expansion issues as a pneumothorax would.