Fig. 2

Histology and immunohistochemistry of the recurred tumor. The tumor had a variety of histologic patterns including (a, 20×) tubular and glandular, (b, 20×) papillary, and (c, 40×) spindled and solid with a heterologous element (cartilage without atypia). Immunohistochemical analysis showed positive staining for (d, 2 × 0) thyroid transcription factor 1 and (e, 20×) GATA-3; however, the tumor was negative for (f, 20×) estrogen receptor