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World J Crit Care Med. Jun 9, 2026; 15(2): 114264
Published online Jun 9, 2026. doi: 10.5492/wjccm.v15.i2.114264
Figure 5
Figure 5 Ultrasonographic features of pleural effusion. A: Pleural effusion manifests as anechoic collection above the diaphragm with presence of spine sign at R4 region; B: Quad sign suggestive of pleural effusion (R4 region). The orange lines mark the borders of the quad sign - vertical borders by the rib shadows and horizontal borders by parietal and visceral pleura respectively.


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