Study Session · Yoel QBank

Review — incorrect questions — Question 2 of 10

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A 58-year-old man is evaluated for a painless thyroid nodule that has enlarged over 2 months. He has no radiation exposure or family history of thyroid disease. Serum TSH is normal, and ultrasonography shows a 4-cm solid nodule in the right thyroid lobe. Fine-needle aspiration biopsy shows follicular cells dispersed in clusters and microfollicles. The patient undergoes right thyroid lobectomy. Which of the following histologic findings would confirm a diagnosis of follicular thyroid carcinoma?

Incorrect — the correct answer is F

Explanation

Respuesta correcta: F. Tumor capsular invasion. Clave clínica (stem-killer): Neoplasia FOLICULAR → la FNA NO distingue adenoma de carcinoma. La malignidad se define por INVASIÓN capsular/vascular (histología, no citología) → carcinoma folicular.

Educational objective

Follicular thyroid carcinoma cannot be diagnosed by cytology/FNA: it requires demonstrating tumor capsular or vascular invasion on histology, which distinguishes it from a benign follicular adenoma (hence the diagnostic lobectomy).

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Details

Source: UWorld
Personal notes: Tema: Carcinoma folicular de tiroides

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