Diagnosis and Management of Hard, Indurated Diffuse Breast Swelling in a Lactating Mother

Differential Diagnosis to Consider

Inflammatory breast cancer (IBC) is a rare but aggressive malignancy that requires dermal edema and breast erythema involving at least one-third of the breast skin with a palpable border to the erythema, as stated by the National Comprehensive Cancer Network 2
Pregnancy-associated breast cancer (PABC) can present with diffuse breast enlargement and may have a falsely benign appearance, though more commonly presents as a discrete palpable mass, according to the American College of Radiology 3, 4

Ultrasound is the mandatory first-line imaging modality for any lactating woman with a breast mass or diffuse swelling, with nearly 100% sensitivity for diagnosis and the ability to differentiate between solid masses, fluid collections, and inflammatory changes, as recommended by the American College of Radiology 4, 1
The American College of Radiology specifically recommends breast ultrasound as first-line due to young patient age and decreased sensitivity of mammography in dense lactating breast tissue 4

If ultrasound shows abscess formation, drainage is the cornerstone of treatment and must be performed immediately, either by needle aspiration or catheter drainage, as stated by the American Academy of Pediatrics 1
The American Academy of Pediatrics recommends drainage combined with appropriate antibiotics and continued breastfeeding 1

Pregnancy-associated breast cancer is increasing as women delay childbearing, representing up to 3% of all breast cancer diagnoses, according to the American College of Radiology 3
PABC typically presents with more advanced disease due to diagnostic delays, as noted by the American College of Radiology 3

Regular and complete emptying of the breast through proper breastfeeding technique is the best prevention for recurrent mastitis, as stated by Praxis Medical Insights 1
If abscess was drained, serial ultrasound may be needed if clinical deterioration occurs or mass enlarges, as recommended by Praxis Medical Insights 6