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The presence of halo is doubtful on gray scale mode, while there is
perinodular blood flow on Doppler mode. This pattern is suspicious
for a follicular tumor.
Nevertheless, the presence of a complete capsule is only one of the
necessary properties in the histopathological diagnosis of a follicular
tumor.
This lesion proved to be hyperplastic nodule on histology.
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There is halo sign on gray scale mode. It seems at first sight, that
the nodule presents parinodular blood flow. By thorough analysis of
Doppler images, it is evident that the extranodular parenchyma presents
extremely increased vascularization while intranodular blood flow is
practically absent. It is equivocal whether the perinodular circulation
corresponds to a true perinodular blood flow or does not.
Final histopathology disclosed an encapsulated papillary carcinoma, i.e. the nodule was
surrounded with a complete capsule.
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