Pleural Effusion in POCUS: Looking Beyond the Diaphragm
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The image demonstrates a pleural effusion identified using Point-of-Care Ultrasound (POCUS). Pleural effusion refers to the accumulation of fluid within the pleural space, between the lung and the chest wall. This finding may be associated with a wide range of clinical conditions including heart failure, infection, inflammatory processes, malignancy, and additional systemic conditions.
On ultrasound, pleural fluid typically appears as an anechoic (black) area located above the diaphragm. In this example, the liver serves as an acoustic window, allowing clear visualization of the diaphragm and the fluid collection positioned superior to it. Depending on the amount of fluid, compressed lung tissue may also become visible within the effusion.
How is pleural effusion evaluated using POCUS?
• Recommended transducer: Low-frequency Convex (Curvilinear) probe for deeper penetration.
• Patient position: Sitting or supine depending on clinical status.
• Scanning location: Usually along the lateral or posterior chest through the intercostal spaces.
• Anatomical landmarks: Identify the diaphragm first, then use the liver (right side) or spleen (left side) as an acoustic window.
• Key scanning points: Assess for the presence of an anechoic collection, evaluate lung compression, and differentiate free pleural fluid from adjacent lung consolidation.
One of the major strengths of POCUS is the ability to perform rapid bedside assessment, integrate findings with the clinical picture, and support real-time decision-making.
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