Solitary ganglioneuroma, neurofibroma (ganglion cells are positive for CD34), leiomyoma (positive for smooth muscle actin), gastrointestinal stromal tumor (GIST), and perineuroma (formerly known as “benign fibroblastic polyp”) should also be excluded [34, 41, 45]. This evidence concerns the gene CD34 and gastrointestinal stromal tumor.