Nuclear morphometry of primary B cell thyroid lymphoma.

Thyroid lymphoma is usually distinguished from anaplastic thyroid carcinoma and from Hashimoto's thyroiditis by morphological and immunohistochemical assessment of tissue sections. Our objective was to assess the value of nuclear morphometry in the differential diagnosis of these conditions. Nuclear area measurements were performed on 10 cases of thyroid lymphoma using an IBAS 2000 Image Analyser and compared with similar measurements performed on 10 cases of Hashimoto's thyroiditis and 2 of anaplastic thyroid carcinoma. It was found that karyometry demonstrated differences between all three conditions, the cases of thyroiditis being distinguishable from lymphoma on the basis of mean nuclear area alone. Mean nuclear area for lymphomas was greater than for Hashimoto's thyroiditis and lower than for anaplastic carcinomas. The mean nuclear area also reflected the grade of lymphoma, with the exception of one case which had a large reactive T cell population. It is concluded that nuclear morphometry provides valuable information in the diagnosis and assessment of thyroid lymphomas.

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