Mesothelioma is predominantly which hemithorax?

Mesothelioma is predominantly which hemithorax?

• A. Right
• B. Left
• C. Bilateral equally
• D. Depends on exposure

Answer: (A)

Right hemithorax involvement is more common in pleural mesothelioma. Across many series, the disease tends to present as a unilateral pleural process, with the right side affected more often than the left. The exact reason for this right-sided predominance isn’t fully understood; possible explanations include subtle differences in pleural surface area or thoracic anatomy between the two sides, but no definitive mechanism has been proven. Since asbestos exposure is systemic, it doesn’t dictate one side being affected over the other, and bilateral disease is less common at presentation. So, the best-supported pattern is right-sided predominance.

Right hemithorax involvement is more common in pleural mesothelioma. Across many series, the disease tends to present as a unilateral pleural process, with the right side affected more often than the left. The exact reason for this right-sided predominance isn’t fully understood; possible explanations include subtle differences in pleural surface area or thoracic anatomy between the two sides, but no definitive mechanism has been proven. Since asbestos exposure is systemic, it doesn’t dictate one side being affected over the other, and bilateral disease is less common at presentation. So, the best-supported pattern is right-sided predominance.