ANMOL S. MAHAL, M.D.; ALLEN B. WEISSE, M.D., F.A.C.P.; PAUL A. BOLANOWSKI, M.D.; LEE B. REICHMAN, M.D., M.P.H, F.A.C.P.
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To the editor: We have read with interest the article by Sandweiss and associates "Ultrasound in Diagnosis, Localization, and Treatment of Loculated Pleural Empyema" (Ann Intern Med 82:50-53, 1975).
The authors concluded that "pleural empyema presents as an echo-free space with a sharp distal border. Fibrosis, on the other hand, shows multiple weak interval echoes and a relatively weak distal border due to the attenuation of sound within the inhomogeneous mass." They presented four cases to prove the above point. They added that "necrotic debris or clotted blood or both could produce echoes within an empyema causing confusion with fibrosis"
MAHAL AS, WEISSE AB, BOLANOWSKI PA, et al. Ultrasound in Diagnosis of Empyema. Ann Intern Med. 1975;83:123–124. doi: https://doi.org/10.7326/0003-4819-83-1-123_2
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Published: Ann Intern Med. 1975;83(1):123-124.
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