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Volume loss of more than this would support predominant collapse over consolidation.Sometimes consolidation is associated with no volume loss or occasionally with lobar expansion, for example, in gram-negative pneumonia or proximal bronchial obstruction with fluid accumulation within the distal lung (drowned lung).This makes it impossible to distinguish infiltrates from atelectasis on the basis of visual density alone. Atelectasis must have volume loss by definition (collapse of airspaces must reduce lung volume), whereas infiltrate does not.Atelectasis in ICU patients occurs most frequently in the left lower lobe, probably because the heart in the supine position compresses the lower lobe bronchus.The diagnosis of microscopic polyangiitis was established and the patient began treatment with pulse intravenous methylprednisolone and cyclophosphamide.
Note: A hallmark of pulmonary oedema is its ability to clear rapidly within hours.We report a patient with fever, fatigue and dry cough who initially had been diagnosed as having pneumonia.A thoracic CT was performed showing widespread multiple nodular lesions, some with a central air-bronchogram and thickened bronchovascular bundles and some connected to nodules.Finally, an extensive review of the literature on microscopic polyangiitis is presented. Lobar pneumonia is typically associated with volume loss of about 25%.