1-Definition:
Is an ill defined pulmonary mass with associated air broncho gram.
2-Causes:
Is due replacing of the air present inside the alveoli by one of the following
-Fluid as in case of pulmonary edema.
-Pus as in pulmonary pneumonia.
-Living cells as in broncho alveolar carcinoma.
-Dead cells as in pulmonary infarction.
-Or blood as in pulmonary contusion.
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