Fig. 2: Histological morphology of the primary tumor and the right supraclavicular lymph node.

A Right lower lobe lung resection specimen: Lung tissue shows focal fibrous tissue proliferation, accompanied by focal lymphocytic and histiocytic infiltration, with areas of necrosis. No residual tumor cells were observed. (HE side, 40×). B Right supraclavicular lymph node from zones IV and V: No evidence of cancer metastasis was found. (HE side, 10×).