 We are interested in radiologic-pathologic correlation in lung tumors. Tumors are known to be heterogeneous; we want to develop an approach that will allow us to explore their spatial organization. We cannot rely on surgical resection to provide tissue for pathologic evaluation, because the majority of lung lesions never come to resection. For example, only 15 of lung cancer patients are surgical candidates. The remainder would be lost to the classical approach that depends on surgery. Percutaneous needle biopsy provides an alternative means of tissue sampling. This is a safe, effective and commonly used way to obtain samples of tissue core samples from any given lung mass. The pathologist can process these core samples in the same way as a surgical specimen. 