Question
A 67-year-old man presents with chest wall pain and chronic nonproductive cough. A chest X-ray reveals a pleural-based mass and a large pleural effusion. A sputum sample is shown in the image. Fluid obtained from the left pleural cavity shows numerous single and clustered neoplastic cells. Which of the following is the most likely diagnosis?
| A. |
Malignant lymphoma |
| B. |
Malignant melanoma |
| C. |
Mesothelioma |
| D. |
Squamous cell carcinoma |
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