Which characteristic differentiates a fibroadenoma from a breast cyst?

A fibroadenoma is typically characterized by its firmness and mobility upon examination, contrasting with breast cysts, which are generally softer and may not be as mobile. Fibroadenomas are solid tumors made up of glandular and fibrous tissue, giving them a firmer consistency compared to the fluid-filled nature of breast cysts. As a result, when palpated, a fibroadenoma often feels more solid and can move freely within the breast tissue, whereas a cyst may feel more fluctuant due to the presence of fluid.

While the presence of fluid is a prominent feature of cysts, the defining characteristic that highlights the difference between a fibroadenoma and a breast cyst is indeed the firmness and mobility of the fibroadenoma. The smooth texture can be seen in both conditions, and while age might play a role in the prevalence of each condition, it is not a defining characteristic that differentiates them directly. Thus, the focus on firmness and mobility provides a clear clinical distinction between these two entities.