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Cytopathology of high‐grade fetal adenocarcinoma of the lung: A case report and cytological analysis

A 66-year-old Japanese woman with a 1-month history of cough and sputum and a smoking history of 5 cigarettes/day for 40 years (11 pack years) was examined. A chest radiograph and CT scan revealed a 7-cm mass in the lower lobe of her right lung. A positron emission tomography scan showed hypermetabolic activity in the mass. She underwent endobronchial ultrasound-guided fine-needle aspiration (EBUS-FNA) at another hospital. The histopathological findings of the biopsy specimen were characteristic of invasive adenocarcinoma. No EGFR mutations in the peptide nucleic acid-locked nucleic acid (PNA-LNA) PCR clamp and no gene fusion between EML4 and ALK in RT-PCR and immunohistochemistry were observed. After the workup, the tumor was staged as a cT3N0M0, Stage IIB neoplasm. 1 month after her initial evaluation, she underwent a right lower lobectomy at our hospital with resection of part of the pericardium.