title: Mesenchymal neoplasia and congenital pulmonary cysts.
abstract: A malignant mesenchymoma exhibiting a varied spectrum of differentiation developed within a congenital pulmonary cyst 6 1/2 years after the cyst was first recognized. Related tumors with a similar gross appearance have been previously described and have included rhabdomyosarcomas and so-called pulmonary blastomas. There is a low but distinct risk for the development of mesenchymal sarcomas within congenital peripheral pulmonary cysts.
mesh_terms: D002648:Child; D003560:Cysts / Q000150:complications / Q000151:congenital* / Q000473:pathology; D005260:Female; D006801:Humans; D008171:Lung Diseases / Q000150:complications / Q000151:congenital* / Q000473:pathology; D008175:Lung Neoplasms / Q000209:etiology* / Q000473:pathology; D012509:Sarcoma / Q000209:etiology* / Q000473:pathology