system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which is the investigation of choice to differentiate between benign and malignant thyroid nodule?
assistant
The correct answer is  FNAC is investigation of choice to diagnose solitary thyroid nodule but it cannot differentiate follicular adenoma from follicular carcinoma Diagnosis of follicular carcinoma is based on vascular invasion/ capsular invasionthat can be seen on biopsy only and not on FNAC