CPAMs are classified into five types based on their histological features:
Type 0: Extremely rare, involves tracheal or bronchial tissue. Type 1: The most common type, characterized by large cysts (more than 2 cm in diameter). Type 2: Composed of smaller cysts (less than 2 cm), often associated with other congenital anomalies. Type 3: Solid, bulky lesions that can cause significant mediastinal shift. Type 4: Characterized by large peripheral cysts, similar to Type 1 but located at the periphery of the lung.
