Differential diagnostic of Hashimoto's thyroiditis: proliferation of oxyphilic cells with only limited number of lymphocytes
Increasing the ratio of oxyphilic cells to lymphocytes, increasing the risk of an underlying oxyphilic cell tumor. Other properties which have to be taken into consideration in cytologic differential diagnostic are the presence of even a few lymphocytes within oxyphilic groups, nuclear debris and prominent nucleoli. Nuclear debris are found in both of the examples presented here. In the first case, the lack of lymphocytes, while in the second case, the presence of nucleoli may lead to false diagnosis of a tumor. Although considering all cytological signs, lymphocytic thyroiditis is more probable than Hürthle-cell tumor, even an experienced cytopathologist is in a difficult situation if he does not get help to make a correct decision analysing such a pattern. Clinical data (hypothyroidism and or elevated aTPO level) and the ultrasound pattern in combination with cytological details can lead to a correct diagnosis .
   
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