Neck Mass Discovered in 25-Year-Old Patient

A 25-year-old man presents with neck pain. Imaging detects a mass in the thyroid gland, and a biopsy is performed. What is your diagnosis?

A 25-year-old man presents with neck pain. Imaging detects a mass in the thyroid gland, and a biopsy is performed.

Based on the image shown, what is your diagnosis?

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