Which one of the following conditions is associated with an exudative pleural effusion?
**Core Concept**
Pleural effusions can be broadly classified into two types: transudative and exudative. Exudative pleural effusions are characterized by high protein content and the presence of cells, usually resulting from inflammation, infection, or malignancy. This classification is crucial for determining the underlying cause and guiding further management.
**Why the Correct Answer is Right**
Exudative pleural effusions occur due to increased permeability of the pleural capillaries, leading to the leakage of fluid, proteins, and cells into the pleural space. This can result from conditions such as tuberculosis, empyema, or malignancy. For example, in the case of malignancy, the tumor can cause direct damage to the pleura, leading to an exudative pleural effusion. The high protein content and cellular composition of exudative pleural effusions make them distinguishable from transudative effusions.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because nephrotic syndrome typically causes a transudative pleural effusion due to hypoalbuminemia and increased hydrostatic pressure in the pleural capillaries.
**Option B:** This option is incorrect because congestive heart failure typically causes a transudative pleural effusion due to increased hydrostatic pressure in the pleural capillaries.
**Option C:** This option is incorrect because cirrhosis typically causes a transudative pleural effusion due to hypoalbuminemia and increased portal pressure.
**Clinical Pearl / High-Yield Fact**
Remember the mnemonic "BILATERAL" to help distinguish between transudative and exudative pleural effusions: B - Blood; I - Infection; L - Lymphoma; A - Amyloidosis; T - Tuberculosis; E - Empyema; R - Rheumatoid arthritis; A - Asbestos exposure; L - Lung cancer. This mnemonic can aid in recalling the common causes of exudative pleural effusions.
**Correct Answer:** C. Malignancy. Malignancy is associated with an exudative pleural effusion due to direct damage to the pleura and increased permeability of the pleural capillaries.