Currently, adenocarcinoma ranks as the number one type of major lung cancer, constituting a significant proportion of all of the non-small cell lung cancers. In contrast to small cell and squamous cell lung cancers which are centrally located, most adenocarcinomas are peripheral, subpleural in location. The few that are central may be visualized endoscopically as endobronchial polyoid masses. Radiographically, adenocarcinomas usually present as a nodular subpleural mass of varying sizes and are often diagnosed as solitary pulmonary nodule. A common finding allowing the diagnosis in some cases is spiculations of the tumor nodules.