Which characteristic differentiates a fibroadenoma from a breast cyst?

A fibroadenoma is a benign breast tumor that is typically firm and mobile upon examination. This characteristic is key in differentiating it from a breast cyst, which is usually softer due to the presence of fluid and may also feel less mobile.

The firmness of a fibroadenoma is due to its fibrous tissue composition, while breast cysts are filled with fluid, giving them a different tactile quality during clinical examination. The mobility of fibroadenomas often allows them to move independently from the surrounding tissue, which can be a distinctive feature noted in clinical evaluations.

While fluid presence is a notable characteristic of cysts, the degree of firmness and the ability to palpate mobility are often more immediately observable in a physical exam between these two entities. Smooth texture can be applicable to both fibroadenomas and cysts, as both may present with a smooth surface on palpation. The age of the patient can also provide some context, as fibroadenomas are more common in younger women, but it is not a definitive characteristic for differentiation during a physical examination. Therefore, the distinguishing feature is primarily the firmness and mobility evident in a fibroadenoma.