Teamwork - differential diagnostics of follicular growth pattern
Follicular adenoma - Case 14
Chronic thyroiditis - Case 9

The patterns are similar: there is no colloid in the background, follicular cellc occur in monolayered sheets and in follicles (predominantly microfollicles). The scattered number of lymphocytes in the case of lymphocytix thyroiditis is not decisive.
The sonographic pattern differs significantly. There is a large, solitary, hypoechogenic nodule with sharp borders in echonormal background in the left case while multiple hypoechogenic lesions with irregular borders are found in a minimally hypoechogenic background in the left case. The adenoma case present signs of a type 1 vascular pattern and the vascularization is not specific in the thyroiditis case.

Taking the sonographic and cytological data into account, we gave the diagnosis of a follicular tumor.
Taking the sonographic and cytological data into account, we gave the diagnosis of a lymphocytic thyroiditis.
mask