What is the role of thyroid ultrasound in evaluating goiter and nodules, including elastography and its limitations?

• A. Ultrasound only measures size with no tissue characterization.
• B. Elastography is always accurate and definitive.
• C. Ultrasound assesses size, composition, and suspicious features; elastography estimates tissue stiffness; limitations include operator variability and false positives/negatives; guides fine-needle aspiration decisions.
• D. Elastography replaces biopsy entirely.

Answer: (C)