Primary pulmonary undifferentiated pleomorphic sarcoma (PPUPS).

Area of Science:

• Oncology
• Pathology

Background:

• Undifferentiated pleomorphic sarcoma (UPS) is a high-grade neoplasm lacking identifiable differentiation markers.
• It is a diagnosis of exclusion, necessitating comprehensive diagnostic evaluation.
• Pulmonary involvement is typically metastatic, making primary lung UPS exceptionally rare.

Observation:

• A 66-year-old male presented with anemia and weight loss.
• A large (17 cm) right lung mass invading the chest wall and diaphragm was identified.
• Extensive sampling and immunohistochemistry failed to reveal a specific line of differentiation.

Findings:

• A diagnosis of Primary Pulmonary Undifferentiated Pleomorphic Sarcoma (PPUPS) was established after excluding extrapulmonary origins.
• A review of 84 previously reported PPUPS/PPMFH cases since 1979 was conducted.
• Clinical information from these cases was summarized.

Implications:

• This case highlights the rarity and diagnostic challenges of PPUPS.
• Understanding the clinical characteristics of PPUPS is crucial for early detection and management.
• Further research may elucidate specific diagnostic markers or therapeutic strategies for PPUPS.