Additional file 5.

OSCC with sarcomatoid component, Case 2. A, Slide overview and magnified insert illustrates the morphology of the primary tumor in case #2 (haematoxylin & eosin). Arrowhead in insert indicates the sarcomatoid, arrow the squamous component. B, Staining with AE1/AE3 cytokeratin cocktail results in strong-moderate labeling of the squamous component (arrow), moderate labeling of the sarcomatoid component (arrowhead) and absence of labeling in the stroma (asterisk).

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Schwock et al. BMC Clinical Pathology 2010 10:1   doi:10.1186/1472-6890-10-1