**5.3 Other examinations**

If nodular lesions coexist, fine-needle aspiration biopsy (FNAB) of the thyroid should be performed. Elastography remains a complementary method to differentiate nodules [18].

#### **Figure 9.**

*Ultrasound image of hyperthyroidism in the course of active mutation in TSH receptor: (a) thyroid gland slightly enlarged bilaterally, inhomogeneous, hypoechogenic; (b) moderately increased vascular flow in Doppler ultrasonography.*

#### **Figure 10.**

*Ultrasound image of hyperthyroidism in the course of Graves' Disease: (a) thyroid gland enlarged bilaterally, inhomogeneous, hypoechogenic; (b) increased, regular vascular flow in Doppler ultrasongraphy.*
