<prompt> Lung to lung metastasis is seen in -Adenocarcinoma of lungSquamous cell carcinomaSmall cell carcinomaNeuroendocrine tumor of lung  <response>: Pulmonary metastasis from primary lung cancer and its treatment. On admission, pulmonary metastases were radiographically found in 44 of 529 patients with adenocarcinoma 8.3, 8 of 427 patients with squamous cell carcinoma 1.9 and 2 of 150 patients with small cell carcinoma 1.3 Ref Harrison 20th edition pg 559 