Fig. 6From: Long-term survival after surgical resection for recurrent hepatic and pulmonary metastases of intrahepatic cholangiocarcinoma: a case reporta Microscopic findings from the lung tumor of S4 show poorly differentiated adenocarcinoma. b CK 7 is positive. c, d CK 20 and TTF-1 are negative (Hematoxylin and eosin staining [× 100] (a), and immunohistochemical expression [× 100] of CK 7 (b), CK 20 (c), and TTF-1 (d))Back to article page