Fig. 2From: Tumor-to-tumor metastases: papillary thyroid carcinoma into a clear cell renal cell carcinomaClear cell renal cell carcinoma containing metastatic deposit of papillary thyroid carcinoma (left side of field; 2a). TTF1 immunostain highlights the focus of papillary thyroid carcinoma but is negative in the clear cell renal carcinoma (2b). Papillary thyroid carcinoma from right lobe of thyroid (2c)Back to article page