A clear cell tumor of the lung presenting as a rapidly growing coin lesion: is it really a benign tumor?

There are few reported cases of clear cell tumor of the lung, a very rare benign mesenchymal neoplasm. We describe a 41-year-old asymptomatic man who presented with a coin lesion in a routine chest roentgenogram that was absent in a roentgenogram performed a year earlier. After a thorough workup, including radionuclide scintigraphy, the diagnosis of cell tumor of the lung was established. Somatostatin receptor positivity was demonstrated, and this clear cell tumor of the lung had a rapid growth rate. Because of these features, the benign nature of such a tumor remains questionable.