Lactating Adenoma Diagnosis and Management

Clinical Presentation and Diagnosis

Lactating adenomas are masses unique to pregnancy and lactation, representing one of the most common benign palpable masses in breastfeeding women, alongside galactoceles, and can contain multiple small cysts on imaging 1, 2
The clinical presentation of a unilateral tender mass in a breastfeeding woman, with involvement of the areolar region and multiple small cysts, matches the characteristics of lactating adenoma 1
These lesions can appear atypical on imaging due to hormonal stimulation causing proliferative and lactational changes, which may lead to concerning features including cystic components 1, 2
The American College of Radiology recommends ultrasound as the first-line imaging examination in lactating women due to young patient age and decreased sensitivity of mammography in dense breast tissue 1, 2

Duct ectasia typically presents with nipple discharge, noncyclical breast pain described as a burning sensation behind the nipple, and is most common in women in their fourth decade, frequently associated with heavy smoking, affecting 17-36% of pathologic nipple discharge cases 3, 4
Intraductal papillomas are a common cause of bloody nipple discharge, rather than presenting as a tender mass with cysts, and typically present with pathologic nipple discharge, spontaneous, unilateral, single duct, serous or sanguineous 4, 5
The National Comprehensive Cancer Network recommends that if imaging shows suspicious features, core needle biopsy is mandatory regardless of the clinical suspicion for benignity 5, 6

Immediate imaging is essential, with over 80% of palpable masses biopsied in breastfeeding women being benign, but evaluation should not be delayed 1, 2
The American College of Radiology suggests that do not delay imaging evaluation assuming all masses in lactating women are benign, as pregnancy-associated breast cancer can present with a falsely benign appearance and has more aggressive biology 1, 2