Plate 2. Normal breast histology, high power (original magnification (200). A single layer of ductal cells sparsely encircled by elongated myoepithelial cells forms the acini within surrounding fibrous tissue. A well-demarcated terminal duct lobular unit is seen on the left. (Florentine B, Felix JC: Fine-needle aspiration cytology of the breast and Felix JC. Pathology of the female breast. In Hindle WH, (ed): Breast Care, A Clinical Guidebook for Women's Health Care Providers. New York, Springer, 1999; with permission; between pages 116 and 117: photographically enlarged ×20%.)