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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: Radiol Clin North Am. 2010 Sep;48(5):931–987. doi: 10.1016/j.rcl.2010.06.007

Fig. 43.

Fig. 43

(A) A normal terminal duct lobular unit (TDLU) composed of numerous acini lined by bland epithelium. (B) A group of acini are cystically dilated with tall cuboidal epithelium: ie, apocrine metaplasia. When imaged with ultrasonography, the TDLU in B is seen as clustered microcysts. (Reprinted from Warner JK, Kumar D, Berg WA. Apocrine metaplasia: mammographic and sonographic appearances. AJR Am J Roentgenol 1998;170:1375–9; with permission.)