Pleomorphic Adenoma: Understanding the Most Common Salivary Gland Tumor Pleomorphic adenoma is the most common benign growth that develops in the salivary glands. Although it is not cancerous in most cases, it still requires medical evaluation and treatment because it can continue to grow over time. https://www.postscontent.com/pleomorphic-adenoma-understanding-the-most-common-salivary-gland-tumor/