<prompt> Fine needle aspiration cytology is not enough to diagnose which of the following?Papillary cancerFollicular cancerMedullary cancerAnaplastic cancer  <response>: - There is no reliable cytologic difference bw follicular adenomas minimally invasive follicular carcinomas. - Hence, FNAC is not enough to diagnose follicular cancer of thyroid. - To differentiate bw these two, extensive histologic sampling of tumor-capsule-thyroid interface to see capsular andor vascular invasion is needed. - Vascular capsular invasion is seen in follicular carcinoma which is absent in adenoma - Criterion for vascular invasion is applicable only to capsular vessels vascular spaces beyond capsule. 