<prompt> Ewas sign is seen in:Acute pulmonary embolismPericardial effusionPneumomediastinumChronic constrictive pericarditis  <response>: In pericardial effusion the base of the left lung may be compressed by pericardial fluid, producing a patch of dullness and increased fremitus and egophony beneath the angle of the left scapula. This is Ewas sign. Ref: Harrisons principles of internal medicine, 18th edition, Page: 1971. 