Source:http://linkedlifedata.com/resource/umls/id/C1334455
MSH: A benign neoplasm of pneumocytes, cells of the PULMONARY ALVEOLI. Originally considered to be vascular in origin, it is now classified as an epithelial tumor with several elements, including solid cellular areas, papillary structure, sclerotic regions, and dilated blood-filled spaces resembling HEMANGIOMA.