Pulmonary Blastoma Presenting as a Solitary Lip Metastasis: Case Report and Review of the Literature

AbstractPulmonary blastoma (PB) is an uncommon primary lung malignancy. This neoplasm was first described by Barrett and Barnard in 1945. The tumor is composed of immature epithelial and mesenchymal tissues which may recapitulate early embryological lung development. Under the microscope, the globular component resembles immature bronchus and connective tissue as seen in embryonic lung. More than one hundred cases have been reported in the literature. PB is more frequent in older people and in males and tends to affect blacks at younger ages. Symptomatology varies from asymptomatic to symptoms of a non-specific pulmonary disease. Cough, hemoptysis, dyspnea, chest pain, respiratory distress, fever, anorexia and weight loss are the most common presenting features. The most common roentgenologic pattern is a well-demarcated peripheral lesion, encapsulated by compression or atelectatic lung tissue, although in some cases there is a tendency to lobulation and cavitation. The size of the mass varies from a smal...