Excisional biopsies histologically showed a large collection of closely juxtaposed, benign salivary-type glands adjacent to a thin fibrotic cyst wall (Figure 4b); no anterior or posterior pituitary tissue surrounded these salivary gland-like tumors, and no immunostaining for transcription factors, synaptophysin or specific anterior pituitary hormones was found. This evidence concerns the gene SYP and cyst.