A 76 year old male with a history of dyspnoea on exeion was subjected to x-ray chest by the treating physician. The findings on the chest X-ray are given below. There is a history of fever with significant loss of weight and occasional bloody diarrhoea for the past 3 months. What is the most likely diagnosis?

This is an X-ray film showing multiple cannonball metastasis in the lung. The following neoplasms are most likely to spread to the lungs. Given the history it is likely to be a colorectal carcinoma. Melanoma Thyroid cancer Breast cancer Colorectal cancer Head and neck cancer Renal cell cancer Choriocarcinoma Testicular cancer Osteosarcoma Ewing sarcoma Wilms tumor Rhabdomyosarcoma Prostate cancer