Objective: Lung pneumocytoma (LP), also called sclerosing hemangioma, is an uncommon tumor of uncertain histogenesis. Method: We analyzed the clinical, morphological, immunohistochemical and ultrastructural features of 5 LP. Results: All 5 patients were women, with median age of 48 year (range: 29-73). Mean size was 26 mm (range 15-45 mm). All tumors were located within the right lung (upperlobe: 1; middle-lobe: 2; lower-lobe: 2). All cases showed solid, papillary, sclerotic, and hemorrhagic patterns. The tumors were composed of 2 cells types: pale polygonal and surface cells. EMA, TTF1, and PR were observed in both type cells. The surface cells showed also positivity for CK7, Napsin-A, and surfactant-A, whereas the polygonal cells for vimentin. Surface cells had short microvilli and lamellar bodies in their cytoplasm. Polygonal cells contained abundant microfilaments and rough endoplasmic reticulum. All patients were alive and well without recurrence at the last follow up. Conclusion: LP is likely to be an epithelial tumor with a differentiation toward type II pneumocytes, which exhibits various architectural patterns. The IHC profile provides useful clues for the diagnosis of this lung neoplasm when typical features are absent. All our cases had an excellent prognosis with no evidence of recurrence following surgery.