Pulmonary edema can be broadly categorized into hydrostatic (cardiogenic) edema and injury (non-cardiogenic) edema. While there is controversy over how accurately the plain chest radiograph can distinguish types of edema, the correct type of underlying pattern is often recognizable on the bedside radiograph, and valuable contributions to the patient's fluid and respiratory management can be made. The plain film also helps to differentiate pulmonary interstitial hydrostatic edema, systemic interstitial edema, central circulating vascular volume, and pulmonary vascular volume ( Milne ^
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