Pulmonary scar carcinoma. A case with two primaries

Area of Science:

• Pulmonology
• Oncology
• Pathology

Background:

• The association between scar tissue and peripheral pulmonary carcinomas is a subject of ongoing research and debate.
• Understanding the etiology of lung cancer, particularly its relationship with scar formation, is crucial for diagnosis and treatment.

Observation:

• A unique case of a 55-year-old male presented with two distinct primary pulmonary carcinomas.
• Both cancers, a large cell carcinoma and an adenocarcinoma, originated at the margins of pleural-based scars in different lobes of the right lung.
• The patient underwent a right pneumonectomy, and subsequent examination showed no lymph node metastasis.

Findings:

• The upper lobe scar was linked to an inactive granuloma, while the lower lobe scar's origin remained unclear.
• The adenocarcinoma in the lower lobe may have an immunological relationship with its associated scar.
• The origin of the scar associated with the large cell carcinoma in the upper lobe is difficult to explain by similar immunological mechanisms.

Implications:

• This case highlights the complex and potentially varied origins of scars associated with lung cancer.
• It suggests that the relationship between scars and carcinoma development may not be uniform across all cases.
• Further research is needed to elucidate the precise mechanisms underlying scar formation and its role in peripheral pulmonary carcinogenesis.