“…They also noted some microliths embedded in an eosinophilic partially collagenized substance resembling an unresorbed, slightly organized exudate, though most were within distended alveolar spaces. A recent report from Japan (Hotchi, Nasu, and Mihara, 1970) drew attention to the presence of nodules in, and thickening of, the alveolar septa, in a case of pulmonary alveolar microlithiasis. Van Gieson elastic staining was reputed as showing the homogeneous nodules to consist largely of elastic fibre and elastoid tissue, but calcification was not mentioned and appears not to have been present in the nodules.…”