title: Is sclerosing hemangioma of lung an alveolar mixed tumour?
abstract: A case of a peripheral lung tumour histologically categorized as a sclerosing hemangioma of the lung is presented. Ultrastructurally, the tumour is composed of a mixture of epithelial and mesenchymal elements in varying stages of differentiation. Type II pneumocytes are identified as one epithelial component, while primitive mesenchymal cells with a tendency to develop into pericytes are the predominant mesenchymal component. The tumour appears to differentiate along the line of the pulmonary alveolar septa, and should be designated as a 'pulmonary alveolar mixed tumour'.
mesh_terms: D002648:Child; D004848:Epithelium / Q000648:ultrastructure; D005260:Female; D018219:Histiocytoma, Benign Fibrous / Q000145:classification / Q000648:ultrastructure*; D006801:Humans; D008175:Lung Neoplasms / Q000145:classification / Q000648:ultrastructure*; D008854:Microscopy, Electron; D009373:Neoplasms, Germ Cell and Embryonal / Q000145:classification; D011650:Pulmonary Alveoli / Q000648:ultrastructure