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Hyalinizing trabecular adenoma: A misnomer for a peculiar tumor of the thyroid gland

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Abstract

We describe the clinical, histological, immunohistochemical, and electron microscopical features of 9 tumors fulfilling the criteria of the so-called hyalinizing trabecular adenoma (HTA) of the thyroid. Six tumors had the characteristic histology of HTA throughout, whereas in the remaining 3 tumors the classic pattern was identified focally in otherwise typical or atypical follicular adenomas. In one case, there was a focus of tumoral tissue outside the capsule, and in another there was a regional lymph node metastasis. Seven tumors were immunoreactive for thyroglobulin and cytokeratins, 1 tumor was positive for thyroglobulin and negative for cytokeratins, and another was negative for thyroglobulin and positive for cytokeratins. Scattered cells immunoreactive for neurotensin and somatostatin were found in 2 cases. Every tumor stained for S100 protein and neuron-specific enolase, but none showed immunoreactivity for calcitonin, calcitonin gene-related peptide, or chromogranin. The irregularity of the nuclear contours, the prominence of the cytoplasmic bundles of intermediate filaments, and the accumulation of basal lamina material around the neoplastic cells without the interposition of a well-defined basal lamina were the most distinctive electron microscopical features. The cytogenetic study performed in one case revealed, apart from cells with a normal karyotype, two abnormal clones: one with a translocation of chromosomes 2-3 and another with the same translocation and trisomies of chromosomes 7 and 12. Our results show that most HTAs display follicular cell differentiation and very low clinical aggressiveness. They also show that some HTAs are able to coexpress follicular cell and neuroendocrine markers and may behave like malignant neoplasms. We conclude that hyalinizing trabecular tumor is a more appropriate generic term than HTA to designate this relatively heterogenous group of lesions of the thyroid gland.

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Sambade, C., Franssila, K., Cameselle-Teijeiro, J. et al. Hyalinizing trabecular adenoma: A misnomer for a peculiar tumor of the thyroid gland. Endocr Pathol 2, 83–91 (1991). https://doi.org/10.1007/BF02915330

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