PMC7270595_01
Axial CT chest scan demonstrating the "crazy paving" pattern.
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A dedicated CT of the chest was obtained, which revealed the diffuse patchy opacities with superimposed intra-lobular septal thickening also known as the "crazy paving" pattern (Fig. 1).
Milky BAL fluid.
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Bronchial anatomy and mucosa were normal but milky fluid was noted on bronchoalveolar lavage (BAL; Fig. 2).
Histopathology of lung parenchyma demonstrating proteinaceous material within the alveoli (A) and positive PAS stain (B).
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Schiff (PAS) stain (Fig. 3). Serum GM-CSF autoantibody concentration was abnormally high at 584.4 mcg/ml (reference <5.0mcg/ml).