A 77-year-old woman presented with stridor and a thyroid mass. At surgery, she had a large ill-defined tumor that involved the entire gland and extended into surrounding strap muscles. A debulking procedure was performed consisting of necrotic and hemorrhagic tumor that grossly replaced the entire gland.
The master list with the correct answer
• Anaplastic medullary carcinoma
• Large cell lymphoma
• Spindle cell sarcoma
• Spindled melanoma
• Undifferentiated (anaplastic) thyroid carcinoma (UTC)
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• Appropriate diagnosis
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