Type Ir Pleuropulmonary Blastoma

**Semantic type:** Neoplastic Process

**Definition:** A subtype of type I pleuropulmonary blastoma characterized by the presence of cysts without the presence of primitive malignant small cells.

**Synonyms:** - Type I Involuted Pleuropulmonary Blastoma - Type I Regressed Pleuropulmonary Blastoma - Type Ir PPB - Type Ir PPB