Abstract
In fine-needle aspiration cytology, most benign adenomatous thyroid nodules and follicular adenomas are categorized together with malignant follicular carcinomas in an indeterminate group called follicular tumors (neoplasms), without stating malignancy probability-follicular or papillary carcinoma. In clinical practice, those developing evidences of malignancy may request further checking or surgical treatment for a histopathological diagnosis. This is frustrating for endocrinologists, surgeons, and patients, requiring more cytological examinations and yielding nonconclusive results. This workshop indicated that many authors create different personal subclassification of indeterminate categories and subgroups with different probabilities of malignancy. Standardization of this approach and cytological criteria must therefore be determined.
