Although two breasts may be of various sizes, their density and structure are usually comparable. Mammograms, a sort of breast exam, are used by doctors to assess the internal structure of the breast.

If a lump is identified on your mammogram and it shows you have asymmetrically thick breasts, the difference in density can be classified into one of four categories:

Asymmetry

Only one projection is used to assess your breasts. Because they are one-dimensional, these images are unreliable. It may be difficult to discern overlapping thick tissues in the breast. Another three-dimensional imaging test will be arranged if your doctor discovers a lesion or abnormality.

Asymmetry at the global level

This finding indicates that one breast has more volume or density than the other. Hormonal changes and natural variation are the most common causes of global asymmetry. If a mass is discovered, your doctor will order more imaging.

Asymmetry in the focal point

On two mammographic pictures, there is a density, but your doctor can't identify if it's a true mass. They'll ask for more imaging and testing to rule out any malignant or atypical tumors.

Asymmetry is being developed

This form of asymmetry implies a considerable difference between previous and current exams. It's possible that the density is new or has increased. These observations are enough to raise the possibility of cancerous cells.

Source: https://www.healthline.com/health/breast-asymmetry#understanding-your-mammogram

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