Lung Hyalinizing Clear Cell Carcinoma

**Semantic type:** Neoplastic Process

**Definition:** An extremely rare, low-grade carcinoma that arises endobronchially in the central airways. It is composed of small to medium-sized malignant epithelial cells with clear and eosinophilic cytoplasm forming nests, cords, and trabeculae in a hyalinized stroma. It is associated with the presence of EWSR1-ATF1 fusion gene.