Histology
Electron bronchoscopy and ultrasound-guided fine-needle aspiration
biopsy of the left supraclavicular lymph node were conducted to obtain
tissue samples from the lung and left supraclavicular area,
respectively. In the tissue from the posterior segment of the right
upper lobe of the lung, a few clusters of atypical cells arranged in a
glandular pattern were visible, with observable mitotic figures. This
finding suggests the presence of adenocarcinoma (figure 5).
The needle biopsy specimen from the fibrous connective tissue of the
left supraclavicular region revealed metastatic adenocarcinoma (figure
6). Immunohistochemistry displayed a CK7+ and CK20-, TTF-1-, and
NapsinA- profile, with a Ki-67 positive rate of approximately 10%.
These findings are consistent with a diagnosis of metastatic lung
cancer.