Ultrasound Diagnosis of Benign Tumors

Abstract

Fibroadenoma is a benign tumor of the mammary gland, which belongs to a group of mixed connective tissue and epithelial tumors. It constitutes up to 95% of all benign breast masses. Phyllodes tumor (phyllodes fibroadenoma, intracanalicular fibroadenoma with a cell stroma) is a mixed connective tissue and epithelial tumor. It demonstrates the incidence not exceeding 0.5–2% of all breast lesions and 2.5–5.4% of all fibroadenomas. Juvenile (giant, cellular) fibroadenoma is a benign fibroepithelial tumor with enlarged convoluted ducts, usually with papillary-cribose proliferation of the epithelium and stroma, with edema and/or desmoplasia. Lipoma is a benign tumor originating from adipose tissue. It accounts for 9% of all breast lesions. True lipoma consists of mature adipose tissue surrounded with a capsule. Intraductal papilloma is represented with a lesion that grows within the lumen of lactiferous ducts. Solitary or multiple lesions may arise. Intraductal papilloma is associated with abnormal discharge from the nipples. Atheroma is retention cyst of the sebaceous gland located in the benign skin and subdermal tissues, which occurs by increased sweating of the sebaceous gland, occlusion of its duct, and forming of a capsule around the fatty content.