Revisiting Pulmonary Sclerosing Pneumocytoma

Area of Science:

• Pulmonology
• Pathology
• Oncology

Background:

• Pulmonary sclerosing pneumocytoma (PSP) is a rare lung tumor, historically misclassified as vascular but now recognized as epithelial.
• Its varied histology and rarity present diagnostic challenges for pathologists, especially in cytology and frozen sections.

Purpose of the Study:

• To provide a comprehensive overview of pulmonary sclerosing pneumocytoma.
• To address diagnostic challenges and controversial aspects, including clinical behavior and tumor associations.
• To highlight a teaching case illustrating tumor concurrence.

Main Methods:

• Narrative review of clinical, histological, immunohistochemical, and molecular data.
• Discussion of diagnostic difficulties in fine-needle aspiration cytology and frozen sections.
• Presentation of a case study involving concurrent lung adenocarcinoma, neuroendocrine lesions, and PSP.

Main Results:

• PSP is of epithelial origin, despite historical classification as a vascular neoplasm.
• Diagnostic challenges stem from its rarity and diverse histological appearance.
• Controversial points include clinical aggressiveness, metastatic potential, multifocality, and sarcomatoid changes.

Conclusions:

• Accurate diagnosis of PSP requires careful integration of histological and immunohistochemical findings.
• Understanding controversial aspects is crucial for appropriate patient management.
• The study emphasizes the importance of recognizing tumor associations in lung pathology.