USMLE Step 1 Practice Exam 2025 – Comprehensive All-in-One Guide for Exam Success!

Question: 1 / 400

Which thyroid cancer commonly presents as a solitary "cold" nodule and is surrounded by a complete capsule?

Follicular adenoma

Follicular adenoma is the correct answer because it commonly presents as a solitary "cold" nodule and is surrounded by a complete capsule. This differentiation is important as follicular carcinoma, while it may also present as a solitary nodule, does not have a complete capsule surrounding it, making option B incorrect. Papillary adenocarcinoma typically presents with a mixture of solid and cystic components, not as a solitary nodule with a complete capsule. Riedel thyroiditis is characterized by extensive fibrosis involving the thyroid gland, not by a solitary nodule with a complete capsule.

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Follicular carcinoma

Papillary adenocarcinoma

Riedel thyroiditis

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