Final answer:
A pleomorphic adenoma is characterized by recurrence after surgical removal and not usually associated with metastases, pain, or ulceration.
Step-by-step explanation:
A pleomorphic adenoma is a benign tumor most commonly found in the salivary glands. It is characterized by its potential to recur after it has been removed surgically. These tumors are generally not associated with metastases, which is the spreading of cancer to different parts of the body, nor are they typically associated with pain or ulceration unless they become very large or undergo malignant transformation. The primary concern with pleomorphic adenomas is their tendency to return, or recur, in the same area if not completely excised. In addition, they can potentially transform into a malignant form known as carcinoma ex-pleomorphic adenoma, especially if they recur repeatedly.