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Head and neck, Thyroid / Parathyroids, Ultrasound, Ultrasound-Colour Doppler, Ultrasound-Spectral Doppler, Treatment effects, Endocrine disorders
T. A. R. R. dos Santos, T. Romero, R. C. L. Coêlho, S. M. Tochetto, M. C. Chammas; Sao Paulo/BR
A progressive reduction in the average volume of the thyroid gland was observed from pre to post treatment evaluations,
performed at 1,
3 and 6 months after radioiodo therapy (p < 0.05).
The mean pre-treatment thyroid volume was 34.8 cm3 and 1 month after treatment was 24.5 cm3,
showing a reduction of 29%.
After the third month of treatment,
the mean thyroid volume was 16.3 cm3,,
representing a decrease of 34% compared to 1 month post treatment evaluation.
After six months of tretment,
the mean thyroid volume was 11.1 cm3,
represening a decrease of 68% from pre-treatment.
All results were statistically significant ( p < 0.05).
The parenchyma echogenicity was subjectively evaluated.
the thyroid gland parenchyma was markdely hypoechogenic and diffusely heterogeneous.
During treatment there was an increase in the echogenicity of the parenchyma and a slight reduction its heterogeneity. Fig. 2
The vascularization of the parenchyma in color Doppler scan was diffusely increased pre-treatment and declined progressively,
but there was no returning to the usual standard of normality. Fig. 3
We also analyzed the peak systolic velocity (PSV ) in the lower thyroid arteries,
right and left.
The VPS inferior right thyroid artery had a mean pre-treatment of 80.69 cm/s and inferior left thyroid artery an average of 76.4 cm/s.
One month after treatment the mean was reduced to 57.5 cm/s at right and 61.19 at left,
showing a reduction of 29 % and 20 %. Fig. 4 Fig. 5
After the third month,
the medium speeds decreased to 37.1 cm/s at right and 37.92 cm/s at left representing a reduction of 35% and 62%,
respectively in relation to prior exam (1 month after the treatment) .
In the sixth month after the treatment ,
the VPS avarage in thyroid right artery was 34.17 cm/s and at left 32.89 cm /s,
resulting in a sharpper decrease than in previous months with medium reductions of 8 % at right and 15 % at left ,
in relation to prior exam (3rd month after treatment) .
the peak systolic velocities of thyroid arteries,
right and left,
showed decrease of 58%,
at sixth month when compared to pre treatment velocities.
All results were statistically significant ( p < 0.5).