Congenital pulmonary lymphangiectasia

Congenital pulmonary lymphangiectasia (CPL), also known as congenital pulmonary lymphangiectasis, is a rare developmental disorder characterized by diffuse dilatation of the pulmonary lymphatic vessels. This condition affects the lungs and can be classified into three forms: a primary developmental defect occurring in isolation, a secondary form associated with pulmonary venous obstruction (such as in congenital heart disease like hypoplastic left heart syndrome or total anomalous pulmonary venous return), or a generalized form occurring as part of widespread lymphangiectasia affecting multiple organ systems. The dilated lymphatic channels impair normal lymphatic drainage in the lungs, leading to fluid accumulation in the pulmonary interstitium and pleural spaces. Infants with congenital pulmonary lymphangiectasia typically present at birth or shortly thereafter with severe respiratory distress, tachypnea (rapid breathing), cyanosis (bluish discoloration of the skin), and pleural effusions (fluid around the lungs). Chylothorax (accumulation of lymphatic fluid in the pleural space) is a common complication. The condition can range from a severe, often fatal neonatal presentation to milder forms that may be diagnosed later in infancy or childhood. Historically, the prognosis was considered very poor, with high neonatal mortality, but improved recognition of milder cases and advances in neonatal intensive care have shown that some patients can survive and even experience gradual clinical improvement over time. Treatment is primarily supportive and includes respiratory support (mechanical ventilation, supplemental oxygen), drainage of pleural effusions, and nutritional management with medium-chain triglyceride (MCT)-based formulas to reduce chylous output. In cases secondary to cardiac anomalies, surgical correction of the underlying heart defect may improve the pulmonary lymphatic condition. There is no definitive cure for the primary form, and management focuses on alleviating symptoms and supporting lung function during the critical neonatal period.

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