What type of breast lesion can appear irregularly rather than uniformly?

Malignant lesions can present with irregular or speculated margins on imaging studies. This irregularity is a key feature that helps radiologists differentiate malignant tumors from benign conditions. Malignant lesions often invade surrounding tissues, leading to an uneven appearance, which can be detected through mammography or ultrasound.

In contrast, benign cysts typically exhibit well-defined, smooth margins, often appearing uniform in shape. Fibroadenomas, another type of benign lesion, generally have smooth borders and are also well defined. Understanding these characteristics is crucial for accurate diagnosis and management in mammography.