inhomogeneous

So this is my second US for thyroid and don't understand terminology. The right lobe measures 5.7x1.9x2.2 cm and the left measures 5.2x1.6x1.9 cm. the isthmus is 2 mm thick. On the previous study the right lobe measured 5.7 cm and the left 5.5 cm. The gland shows mildly inhomogeneous...