Figure 3
From: Primary pulmonary adenocarcinoma mimicking papillary thyroid carcinoma
Immunohistochemistry showed that TTF-1 was diffusely and strongly nuclear positive in pulmonary tumor tissue (A, ×200). SPA was diffusely and strongly plasma positive in pulmonary tumor tissue (B, ×200) and lymph node (C, ×200). Thyroglobulin was negative in pulmonary tumor tissue (D, ×200). Thyroglobulin was positive in thyroid tissue as a positive control (E, ×200). TTF-1, thyroid transcriptor factor-1; SPA, surfactant apoprotein A.