Purpose: To report a case of small cell carcinoma of the thymus metastatic to the orbit.
Methods: At age 37 years, a man who had been previously diagnosed and treated for small cell carcinoma of the thymus was initially examined for vertical diplopia and left proptosis. Computed tomographic scan disclosed a soft tissue mass in the superior aspect of the left orbit. A fine-needle aspiration biopsy of the mass was performed and submitted for cytopathologic examination.
Result: The cytopathology and immunopathology disclosed malignant cells consistent with metastatic small cell thymic carcinoma.
Conclusion: This is the first reported case of a primary thymus gland tumor metastatic to the orbit.
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