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The sections from each lung wedge showed similar features, with each containing a well circumscribed, solid lesion with a diffuse patternless architecture and composed of relatively monomorphic mononuclear cells along with somewhat evenly distributed multi-nucleated giant cells. Mononuclear and multinucleated cells display similar nuclear morphology. Mitotic figures are present in small numbers. There is mild focal haemorrhage and no necrosis. The surrounding alveolated lung parenchyma shows no significant abnormality.