You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Most sensitive investigation of thyroid nodule: and explain in detail?
PET scan are not routinely used in the evaluation of thyroid nodules, however, they may show clinically occult thyroid lesions. USG is the most sensitive method for diagnosing intrathyroid lesions. CT and MRI are neither specific nor sensitive in diagnosing the intrathyroid lesions.