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Background Dengue fever (DF) is an acute infection caused by a flavivirus. Although most patients present mild symptoms, some progress to a severe condition characterized by hypovolemic shock and hemorrhagic phenomena. The main feature of this severe form of DF is plasma leakage. Gallbladder wall thickening (GBWT), ascites and pleural effusion represent the sonographic triad of plasma leakage in DF...