Fig. 4From: Ciliated muconodular papillary tumor of the lung: a case report and literature reviewA Ciliated cells, mucous cells, and basal cells positive for CK7 (EnVision, ×100). B TTF-1 is weak to moderately positive in the basal cells but negative in the luminal cells. C Cells lining the cavity are positive for CEA (EnVision, ×100)Back to article page