So-called sclerosing hemangioma of lung: current concept.

Sclerosing hemangioma of the lung is a rare neoplasm with polymorphic histologic features. Despite various patterns, there are 2 unifying cellular components: "surface cells" and "round cells." Although histogenesis has been debated for decades, most ultrastructural, immunocytochemical, and molecular studies strongly indicate a neoplastic epithelial derivation for both cellular components. Herein, we present a review of sclerosing hemangioma and summarize the essential data regarding histologic, cytologic, and ancillary findings of this distinctive pulmonary neoplasm.