This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
FNAC is useful in all except: March 2007, March 2012 
Select and explain. 
A. Follicular carcinoma, B. Papillary carcinoma, C. Anaplastic carcinoma, D. Medullary carcinoma
A: Follicular carcinoma
Answer: A: Follicular carcinoma 
Explanation: Ans. A: Follicular carcinoma Thyroid conditions which can be diagnosed by FNAC include : Colloid nodules Thyroiditis Papillary carcinoma Medullary carcinoma Anaplastic carcinoma Lymphoma FNAC cannot distinguish between a benign follicular adenoma and follicular carcinoma, as this distinction is between is dependent not on cytology but on histological criteria, which include capsular and vascular invasion.