Synchronous multiple lung cancers with hilar lymph node metastasis of small cell carcinoma: A case report

Figure 5 Histopathological findings. A: Primary lesion in the right upper pulmonary lobe. The staining results indicate squamous cell carcinoma [hematoxylin-eosin (HE) staining, Scale bar: 50 μm]; B: Primary lesion in the right upper pulmonary lobe. The immunohistochemical staining results are positive for p40 (Scale bar: 20 μm); C: A lesion located on the cranial side of the primary lesion. The staining results indicate microinvasive adenocarcinoma (HE staining, Scale bar: 50 μm); D: Lobar bronchial lymph node (#12u). The staining results indicate small cell carcinoma (HE staining, Scale bar: 50 μm).