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Mucinous tumors of the lung are uncommon neoplasms that have recently been the subject of much debate regarding their proper terminology and classification. Several histopathologic descriptions of mucinous tumors of the lung have been made in the literature, ranging from benign to borderline to malignant tumors. Proper classification of mucinous tumors of the lung into these categories is difficult if not impossible the histopathologic and gross anatomic features of the various descriptions of mucinous tumors of the lung as reported in the literature show extensive overlap, suggesting that they may represent a homogeneous condition rather than several separate entities. This article attempts to clarify some of these issue and propose criteria for the proper classification of these tumors.