Which statement best summarizes risk factors for thyroid cancer and the role of fine-needle aspiration (FNA) in management?

Which statement best summarizes risk factors for thyroid cancer and the role of fine-needle aspiration (FNA) in management?

• A. Diet high in iodine is sole risk factor and ultrasound alone determines management.
• B. Family history decreases risk and FNA has no role.
• C. Genetic testing alone suffices to guide management and FNA unnecessary.
• D. Radiation exposure increases risk; FNA cytology categorizes nodules to guide observation versus surgery.

Answer: (D)

Ionizing radiation exposure is a real risk factor for thyroid cancer, especially when exposure occurs in childhood or involves the neck area. The role of fine-needle aspiration is to obtain cells from a thyroid nodule so cytology can guide management. With FNA results, clinicians categorize nodules to decide between observation and surgery: benign cytology usually means monitoring with ultrasound, while suspicious or malignant cytology points to surgical removal; indeterminate results may lead to repeat FNA or additional testing to clarify the plan. This combination—recognizing radiation exposure as a risk and using FNA cytology to triage nodules—best captures how risk factors translate into practical management. The other statements aren’t correct because iodine intake isn’t the sole risk factor, family history doesn’t lower risk and FNA does have a key role, and genetic testing alone cannot replace cytology in guiding treatment decisions.

Ionizing radiation exposure is a real risk factor for thyroid cancer, especially when exposure occurs in childhood or involves the neck area. The role of fine-needle aspiration is to obtain cells from a thyroid nodule so cytology can guide management. With FNA results, clinicians categorize nodules to decide between observation and surgery: benign cytology usually means monitoring with ultrasound, while suspicious or malignant cytology points to surgical removal; indeterminate results may lead to repeat FNA or additional testing to clarify the plan. This combination—recognizing radiation exposure as a risk and using FNA cytology to triage nodules—best captures how risk factors translate into practical management. The other statements aren’t correct because iodine intake isn’t the sole risk factor, family history doesn’t lower risk and FNA does have a key role, and genetic testing alone cannot replace cytology in guiding treatment decisions.