Undifferentiated thyroid carcinoma

October 23, 2013
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Pathology Clinic

Histologically, undifferentiated thyroid carcinomas show a variety of patterns, from sheet-like, storiform, fascicular, angiomatoid, and meningothelial to solid, exhibiting extensive lymph-vascular invasion.

Undifferentiated carcinoma (also known as anaplastic carcinoma) of the thyroid gland is a highly aggressive malignant neoplasm composed of undifferentiated cells that exhibit immunohistochemical or ultrastructural epithelial differentiation. Nearly all patients report a long history of thyroid gland disease, often goiter or Hashimoto thyroiditis. In most cases, there is a transformation from a papillary (80%) or follicular carcinoma into undifferentiated carcinoma. Radiation exposure is reported in about 10% of patients.

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