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Identification of venous invasion of rectal neuroendocrine tumor on serial tissue sections. (C) Lymphatic invasion was difficult to identify using only hematoxylin–eosin staining. Original magnification: ×200. (D) Elastica van Gieson staining greatly improved the identification of venous invasion by dark staining of venous elastic fibers. Original magnification ×200. The labels for the figure panels should start with (A), then (B), independently for each figure.
