Fig. 2From: Identification of a metastatic lung adenocarcinoma of the palate mucosa through genetic and histopathological analysis: a rare case report and literature reviewCytological diagnosis using cell block samples from pleural effusion. a Hematoxylin and eosin (HE) staining at a 400× magnification. b Positive staining of cytokeratin 7 (CK7). c Negative staining for thyroid transcription factor 1 (TTF-1)Back to article page