| http://www.w3.org/ns/prov#value | - Pleural effusion is an indicator of an underlying disease process that may be pulmonary or nonpulmonary in origin and may be acute or chronic.[4, 5] Although the etiologic spectrum of pleural effusion is extensive, most pleural effusions are caused by congestive heart failure, pneumonia, malignancy, or pulmonary embolism.
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