Ewa's sign is seen in:: (A) Acute pulmonary embolism, (B) Pericardial effusion, (C) Pneumomediastinum, (D) Chronic constrictive pericarditis
Answer is B. 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 Ewa's sign. Ref: Harrisons principles of internal medicine, 18th edition, Page: 1971.