[Ultrasound study in the differential diagnosis of thyroid focal lesions of various origin].

The present study deals with the ultrasound differential diagnosis of thyroid lesions. A hundred and ninety-two patients, including 130 patients with benign diseases (nodular colloidal goiter) (36.9%), chronic autoimmune thyroiditis (30.7%), and adenomas (32.3%) and 62 patients with malignant diseases (thyroid cancer (88%), lymphoproliferative diseases (6.4%), and recurrent thyroid cancer) (4.8%), were clinically examined. Ultrasound studies (USS) were performed in the B- and (see text symbols) modes. The diagnosis was verified from cytological and histological findings with mandatory morphological confirmation. Interdisease comparison has shown that USS is both a screening and diagnostic technique in revealing thyroid changes and determining their site, sizes, and structure. Ultrasound pathognomonic signs were detected in different morphological types of adenomas, thyroiditis, and nodular colloidal goiter, in the classical, pseudoadenomatous and pseudocystic types of thyroid cancer. At the same time there were characteristic ultrasound parameters at the stage of pronounced changes in undifferentiated thyroid cancer (pseudothyroiditis), lymphoproliferative diseases, and acute thyroiditis. The exception was the diffuse form of chronic autoimmune thyroiditis in which both thyroid lobes were always altered.