In breast ultrasound, what does an "irregular mass" typically indicate?

An irregular mass observed in a breast ultrasound is often indicative of possible malignancy. This is due to the fact that benign tumors, such as fibroadenomas, typically present as well-defined, round, or oval masses with smooth margins. In contrast, malignant lesions tend to show irregularities in shape and margins, which can suggest an invasive process.

The irregularity of the mass raises concern about the possibility of cancer because irregular shapes and poorly defined edges are characteristic of tumors that are growing in an uncontrolled manner, often indicating that the tumor has infiltrated surrounding tissues. This propensity for invasive growth is a key difference in how various types of breast lesions are assessed during ultrasound evaluations.

Given these points, the identification of an irregular mass often prompts healthcare providers to pursue further diagnostic testing, such as a biopsy, to determine the nature of the tissue involved. While further imaging can be necessary for assessment, the immediate implication of an irregular mass leans towards a higher risk for malignancy.