Neck ultrasound measurement variance

Is it normal to have a variation in Thyroid measurements via neck ultrasound ?

I have had 4 ultrasounds by 3 different radiologists and the measurement of my thyroid gland and nodule varies varies each time.

Is the size of my gland and nodule changing every 1-2 months or are the radiologists not competent ?

Here are the measurements:

9th September - First Ultrasound by radiologist A:

Right lobe measures 5.6 x 2.2 x 1.7 Cm Left lobe : 4.4 x 1.5 x 1.1 Nodule on right lobe : 3.6 x 1.6 cm

1st October - Second ultrasound by Radiologist B

Thyroid measurement - not taken Nodule on right lobe - 3.1 x 1.8 x 1.6 cm

8th December - Third Ultrasound by Radiologist C

Right lobe - 3.7 x 2.2 x 2.1 cm Left lobe - 3.8 x 1.9 x 1.3 cm Nodule on right lobe : 2.8 x 1.6 x 1.3 cm

11th February- Fourth ultrasound by Radiologist C

Right lobe : 5.1 x 2.1 x 2.2 cm Left lobe : 4.8 x 1.4 x 1.4 cm Nodule on right lobe - 3.5 x 1.5 x 1.5 cm

So if you see above, there is so much variance in the 4 ultrasounds ? The last two were by the same radiologist.

Machine used was a 12 mhz high resolution.

I asked the radiologist about the variance and they are all evasive and say we can’t comment, we just report what we see.

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