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We report a case of intra-articular fracture of the knee joint showing at a first Ultrasonographic (US) evaluation two layers within joint effusion: a superior hyperechoic layer with oval hypoechoic structures interpreted as blood trapped in the layer of fat and an inferior hypo-anechoic layer of blood. After joint immobilization three layers were shown by Computed Tomography (CT) scan (double fluid–fluid...