What is gynecomastia?

Updated: Mar 22, 2018
  • Author: George Ansstas, MD; Chief Editor: George T Griffing, MD  more...
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Answer

Gynecomastia is a benign enlargement of the male breast resulting from a proliferation of the glandular component of the breast (see the image below). Gynecomastia is defined clinically by the presence of a rubbery or firm mass extending concentrically from the nipples. Although the condition is usually bilateral, it can be unilateral. The condition known as pseudogynecomastia, or lipomastia, is characterized by fat deposition without glandular proliferation. (See Etiology, Presentation, and Workup.)

Adolescent gynecomastia. Adolescent gynecomastia.

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