| Fat droplets, cholestasis, or alcoholic hyaline may on occasion appear within cells of the adenoma. |
| The majority of cases are caused by a somatotroph adenoma of the anterior pituitary, and most are confined to the sella. |
| Histology showed necrosed tissue, which was strongly indicative of pituitary adenoma. |
| The differential diagnosis on a biopsy included adenoid cystic carcinoma and basal cell adenoma. |
| Conclusions: According to these findings, enucleation surgery on a pleomorphic adenoma should not be performed anymore. |
| Pleomorphic adenoma is a benign neoplasm that occurs in major or minor salivary glands. |
