This chest x-ray is of a 62 y/o male smoker with a central upper lobe mass (Ca). Upon further examination this mass is found to be malignant. Taking into account the hilighted information, what is the most likely diagnosis?

1. small cell carcinoma
2. squamous cell carcinoma
3. large cell carcinoma
4. adenocarcinoma
5. bronchoalveolar

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