Hypothyroidism presenting as a hot pertechnetate nodule.
The authors report an uncommon finding of hot nodule on Tc-99m sodium pertechnetate thyroid scan in three patients with hypothyroidism. Data indicate that hypothyroidism is secondary to Hashimoto's disease (HD). There was a concordant aspect on I-131 scan in two; a nodular discrepancy (cold nodule with I-131) was associated with the highest microsomal antibodies titer. The findings of thyroid scan and ultrasonographic findings indicate that hot nodules may be observed either on initial or advanced stages of HD. Color flow Doppler sonography, showed an absence of internal increase of vascularization. These data suggest that the observed hot nodules correspond to localized hyperplasia of the less diseased portions secondary to chronic stimulation by TSH.
Boughattas
Sami
S
Department of Nuclear Medicine, Sahloul's Hospital, Sousse, Tunisia. BOUGHATTASSAMI@netscape.net
Arifa
Nadia
N
Kacem
Maha
M
Chatti
Kaouther
K
Riahi
Nabiha
N
Hassine
Habib
H
Essabbah
Habib
H
D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007037:Hypothyroidism / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000209:etiology*; D008875:Middle Aged; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D013670:Sodium Pertechnetate Tc 99m; D016606:Thyroid Nodule / Q000175:diagnosis / Q000000981:diagnostic imaging*; D013967:Thyroiditis, Autoimmune / Q000150:complications* / Q000175:diagnosis / Q000000981:diagnostic imaging*
D019275:Radiopharmaceuticals; D013670:Sodium Pertechnetate Tc 99m