Thyroid Carcinoma on the Side of the Absent Lobe in a Patient with Thyroid Hemiagenesis

Figure 5

Histopathological (hematoxylin and eosin) and immunohistochemical findings for Sections B and C in Figure 3. Images (a), (c), and (d) are from Section B (thyroid papillary carcinoma), while images (b) and (d) are from Section C (poorly differentiated carcinoma) in Figure 3. (a) The tumor shows a ductal structure with funicular and microfollicular shapes, consistent with thyroid papillary carcinoma. (b) A honeycomb structure and necrosis are observed, with marked differences in nucleus sizes; these findings suggest poorly differentiated carcinoma. (c, d) Both papillary carcinoma and poorly differentiated carcinoma sites are thyroid transcription factor-1-positive. (e) Nuclear grooves under high magnification.

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