Two cases of symptomatic gastrointestinal metastases from primary lung cancer

Primary lung cancer is relatively common malignant tumor throughout the world and often spreads to the contralateral lung, liver, brain, adrenal gland, and bone. However, metastatic involvement of gastrointestinal tract from lung cancer is an infrequent clinical entity characterized by very poor prognosis and rectal metastases, in particular, are an extremely rare occurrence. We report here the cases of two patients presenting with abdominal pain or hematochezia and a presumed diagnosis of gastrointestinal metastases from primary lung cancer.