Characteristic properties - atypical cells in follicular tumors (II)
Follicular adenoma - Case 19
Follicular carcinoma - Case 2

Both cases present pleomorphic cells which is not a frequent finding in well-differentiated follicular tumors. Follicular cells have abundant cytoplasm. In the case of adenoma even oxyphilic metaplasia has to be considered. The right case is even more suspicious because of the presence of grooves and inclusions. Nevertheless, the cytological diagnosis is in both cases follicular tumor with greater than the average risk for carcinoma.