From the case: Pleomorphic adenoma: parotid gland
Pleomorphic adenomas arising in the parotid usually have a thick fibrous capsule as seen here. The normal parotid tissue is to the upper right of the capsule and the tumor is on the lower left. The capsule can be variable in thickness and may even be absent. Pleomorphic adenomas arising in the minor salivary glands are well-demarcated but usually not encapsulated.