A 69-year-old woman presented with a large anterior mediastinal mass. Grossly, the mass was 1150 g, 16.5 x 15.0 x 10.0 cm. Sectioning revealed a well-circumscribed, encapsulated tumor with tan-pink to grey, focally nodular, hemorrhagic, cystic, and necrotic cut surfaces, which was adherent to, but did not invade the left lung parenchyma.
The master list with the correct answer
• Solitary fibrous tumor
• Spindle cell thymoma (WHO type A)
• Synovial sarcoma
• Thymic carcinoid, spindle cell variant
• Thymic carcinoma
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