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Ultrasound M-mode and B-mode of effusions. A) Nearly totally absent sinusoid sign in case of exudate. B) Small (due to low tidal volume) sinusoid sign in case of transudate. C) Jellyfish sign (white arrowhead). D) Small effusion, partially in major fissure (white arrowhead). Note irregularity due to small compressive atelectases and ground glass change – also due to atelectasis (image of B-lines is not so evident due to harmonics, discussed later)
