Pulmonary Mucinous Cystic Tumor of Borderline Malignancy

**Semantic type:** Neoplastic Process

**Definition:** A very rare, non-invasive epithelial neoplasm that arises from the lung. It is composed of multilocular cysts filled with mucus. The cysts are lined with columnar mucinous epithelium. Focal cellular atypia is present.

**Synonyms:** - Lung Mucinous Cystic Tumor of Borderline Malignancy - Lung Mucinous Cystic Tumor of Low or Borderline Malignancy - Mucinous cystic tumor of borderline malignancy - Pulmonary Mucinous Cystic Tumor of Low or Borderline Malignancy