Evaluation of a Breast Nodule

Initial Clinical Assessment

The American College of Radiology recommends that for any breast nodule, diagnostic imaging should be performed immediately, with diagnostic mammography for women ≥30 years (followed by targeted ultrasound) or ultrasound alone for women <30 years, as physical examination alone is unreliable and cannot distinguish benign from malignant lesions 1, 2
The National Comprehensive Cancer Network recommends documenting patient age, menopausal status, personal history of breast disease, family history of breast/ovarian cancer, and any breast symptoms (skin changes, nipple discharge, pain) 3, 4, 5
The American College of Radiology recommends performing systematic visual inspection with the patient sitting, hands on hips to contract pectoralis muscles, assessing for asymmetry, skin changes (erythema, peau d'orange, dimpling), and nipple changes (retraction, scaling) 3, 5
The National Comprehensive Cancer Network recommends palpating with patient supine, ipsilateral arm overhead, using finger pads in overlapping circular motions with three pressure levels (light, medium, deep) covering the entire breast tissue pentagon and all nodal basins (axillary, supraclavicular, infraclavicular) 3, 5

The American College of Radiology recommends starting with targeted breast ultrasound as the initial study for women under 30 years to avoid unnecessary radiation exposure 1, 2
The American College of Radiology recommends beginning with bilateral diagnostic mammography (not screening mammography) for women ≥40 years to characterize the palpable lesion, screen the remainder of both breasts, detect calcifications/architectural distortions, and provide baseline documentation 1, 2
The American College of Radiology recommends following immediately with targeted ultrasound of both breasts to identify additional lesions, characterize solid versus cystic nature, evaluate bilateral axillae, and guide potential biopsy 1, 2

The National Comprehensive Cancer Network recommends proceeding directly to core needle biopsy (preferred over fine needle aspiration) for BI-RADS 4-5 lesions 3, 1, 2
The American College of Radiology recommends using ultrasound-guided core biopsy whenever the lesion is visible on ultrasound, providing real-time needle visualization, no breast compression, no radiation exposure, and allowing axillary evaluation 1, 2
The National Comprehensive Cancer Network recommends obtaining at least 2-3 cores from each suspicious lesion 1
The National Comprehensive Cancer Network reports that BI-RADS 4 lesions have 3-94% malignancy risk, and BI-RADS 5 lesions have ≥95% malignancy risk 3

The European Society for Medical Oncology recommends that the pathology report for core needle biopsy specimens should include histologic type and grade, estrogen receptor (ER), progesterone receptor (PgR), and HER2 status by immunohistochemistry or FISH/CISH, proliferation markers (Ki67 labeling index), and vascular/lymphovascular invasion if present 6, 4