Lange Mammography Practice Exam

A large encapsulated mass in the breast is most characteristic of a lipoma, a benign tumor made of fat tissue. Lipomas are typically well circumscribed and often have a thin fibrous capsule, giving them a smooth, encapsulated appearance on imaging. This clear boundary helps distinguish them from other findings. Fat necrosis can produce calcifications or oil cysts after trauma, but its appearance is usually more irregular and associated with a history of injury, rather than a large, uniform encapsulated mass. Calcifications themselves are deposits of mineral material and do not form a sizable mass. Ductal carcinoma tends to present as an irregular, spiculated mass or with suspicious microcalcifications, not a large, well-defined encapsulated lesion. Therefore, the large encapsulated mass most commonly linked with a benign lipomatous tumor is lipoma.