Fig. 6

Histopathological findings. a Tumor cells are eosinophilic and show solid growth (scale bar 50 μm). b Capsular invasion (scale bar 500 μm). c Vascular invasion (scale bar 50 μm). d Negative staining for TTF-1 (scale bar 500 μm). e Negative staining for thyroglobulin 1: (scale bar 500 μm) 2: (scale bar 50 μm). f Negative staining for chromogranin A (scale bar 100 μm). g Positive staining for PTH (scale bar 50 μm). h Positive staining for parafibromin (scale bar 50 μm)