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 (usually bilateral but sometimes unilateral) resulting from a proliferation of the glandular component of the breast (see the image below). It is defined clinically by the presence of a rubbery or firm mass extending concentrically from the nipples. Gynecomastia should be differentiated from pseudogynecomastia (lipomastia), which is characterized by fat deposition without glandular proliferation.

Adolescent gynecomastia. Adolescent gynecomastia.

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