Echogenic Swirling Seen on Ultrasound and Outcome of Pleurodesis in Malignant Pleural Effusion Maged Hassan; Rachelle Asciak; Rachel M. Mercer; David J. McCracken; Stamatoula Tsikrika; Hany Shaarawy; Anwar Elganady; John M. Wrightson; Najib M. Rahman;