Third left pulmonary lobe.

A 67-year-old man with a 20 pack-year smoking history presented to our hospital with a month-long persistent cough. Blood tests showed elevated serum tumour biomarkers including neuron-specific enolase and carcinoembryonic antigen up to 10-fold the normal range. CT examination of the chest and whole abdomen revealed a 5 cm mass located on the left upper lobe with diffuse metastasis in both lobes of the lung. In addition to the mass in the left upper lung lobe, we also observed extra lung tissue with notable interstitial markings and the presence …