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Figure 1. H&E, 5x. | Figure 2. H&E, 10x. |
![]() | CLINICAL HISTORY: 63yo male, with a history od NHL (Diffuse large B-cell lymphoma) presented with a 25×25 mm nodule in the right upper lobe. Histopathological examination revealed squamous cell carcinoma with an adenocarcinoma component comprising <5% of the entire tumor. |
Figure 3. TTF-1 positivity in adenocarcinoma component. Note the lack of TTF-1 positivity in adjacent squamous cells. |