Is it normal to have undilated milk ducts?

The description “no ductal dilatation” alone is normal, but it should be combined with other imaging features, such as a mass, to make a comprehensive judgment.
Ductal dilatation is defined as a larger than normal diameter of the milk ducts. In most cases, ductal dilatation found on imaging may not be meaningful, and needs to be combined with other imaging features such as masses, calcifications, nodules, and filling defects on ductography, as well as clinical signs such as palpable masses, skin dimpling, and nipple overflow, to make a clinical diagnosis.
Ductal dilatation may indicate the presence of intraductal lesions, including intraductal papilloma, intraductal papillary carcinoma, ductal carcinoma in situ, and invasive breast cancer. Therefore, the description of “no ductal dilatation” alone is normal, but it should be combined with other imaging descriptions, such as a mass, to make a comprehensive judgment.
If the test result is abnormal, it is recommended to follow the doctor’s instructions for regular review or timely treatment, and do not blindly treat the disease, which may cause adverse consequences.