Lung cancer is the second most common cancer in the United States with an estimated incidence of 13.5% of all new cancer cases. They are fairly aggressive and are responsible for 25% of all cancer deaths. Lung cancers rarely metastasize to gastrointestinal (GI) tract and it is expected that advanced disease is present when metastasis to the GI tract occurs, thus implying a poor prognosis. We present a case of a middle-aged man who was diagnosed with metastatic lung cancer while undergoing a routine screening colonoscopy. A 56-year-old man with past medical history of hypertension, hepatitis C not on treatment and colon polyps and family history of colon cancer in his father comes to our office for a routine screening colonoscopy. Several polyps were identified and removed. A benign-appearing 9 mm polyp of the ascending colon was removed over a saline pillow. Following the resection, it appeared that the lesion involved the colon wall and endoclips were placed because of the transmural defect. The specimen was sent for histology and showed metastatic adenocarcinoma with invasion from the deep aspects beneath the muscularis propria. Immunohistochemical stains were positive for CD 7, TTF-1 and negative for CD20, CDX2, NAPSIN-A, PSA, PSAP, PAX-8, and GATA-3. This pattern was suggestive of a primary lung adenocarcinoma. A follow-up appointment was made with the patient for a CT scan of the chest which showed a 6.5 cm right hilar mass abutting the major branches of the right pulmonary artery and causing narrowing of the bronchus intermedius and right lower lobe bronchus with subcarinal and mediastinal lymphadenopathy up to 2.7 cm. Upper endoscopy of stomach and duodenum was normal. An abdominal MRI with and without intravenous contrast done a month ago did not show any focal hepatic lesion with patent portal and hepatic veins and normal bile ducts and pancreas. MRI of the brain showed ten enhancing intracranial metastasis. Bronchoscopy was performed for a definitive diagnosis of metastatic adenocarcinoma of the lung. Primary lung cancer that metastasizes to the GI tract is considered to be rare and often late presentation. They usually present as a solitary nodule with a preponderance for the male sex. Due to the lack of presenting symptoms, it can be exceedingly difficult to diagnose. Our case is unique as the patient's underlying primary adenocarcinoma of the lung was diagnosed after he had a screening colonoscopy.