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.
40x H&E: Low-power view showing sharp circumscription from otherwise normal-appearing alveolated lung parenchyma. The tumour is solid and displays a diffuse, patternless architecture.
100x H&E: Medium-power view showing patternless pattern and mononuclear cells with relatively evenly distributed multinucleated cells.
200x H&E: High-power view showing relatively monophorphous appearance to cells. At this power, the similarity in nuclear features between mononuclear and multinucleated cells can be appreciated. There is no significant nuclear pleomorphism.