Fibroepithelial lesions account for the overwhelming majority of solid breast masses affecting women younger than age 20. Nearly all present as self-detected or provider-detected palpable masses. All fibroepithelial lesions are composed of stromal (fibrous) and glandular (epithelial) elements and variable histology. Rapidly growing mobile breast masses in girls or female adolescents may represent juvenile fibroadenomas, which have different but benign histological features when compared to typical fibroadenomas. Benign phyllodes tumors closely resemble usual fibroadenomas and juvenile fibroadenomas on imaging. Decisions whether to biopsy these tumors are made clinically; the diagnosis of phyllodes tumor depends on histological assessment.This chapter, appearing in the section on circumscribed mass, reviews the key clinical and imaging features, differential diagnosis, and management recommendations of large solid breast masses affecting young women, including typical fibroadenomas, giant fibroadenomas, juvenile fibroadenomas, and phyllodes tumors.
‘Making’ as a Catalyst for Engaging Young Female Adolescents in STEM Learning
