label: Fetal Lung Interstitial Tumor
label_lc: fetal lung interstitial tumor
description: "A congenital benign tumor of lung interstitial mesenchymal cells that presents with respiratory symptoms in neonates. Images reveal a well-circumscribed solid or partially cystic lung mass. Microscopical examination reveals widened alveolar septa that contain bland, uniform mesenchymal cells. Some cases show ALK rearrangement and A2M-ALK gene fusion."