Figure 6From: Primary presacral neuroendocrine tumor associated with imperforate anusH&E, synaptophysin, chromogranin and S-100 staining of the resected tumor. A) H&E stain showing uniform cells arranged in chords. B) Synaptophysin and C) chromogranin staining were strongly positive. D) S-100 staining was negative (positive stain on the photograph represents a nerve which serves as an internal control).Back to article page