MediAI

  Breast Hamartoma Overview Cause and Etiology Breast hamartomas are benign, tumor-like malformations composed of normal breast elements— glandular, fibrous, and fatty tissue —in a disorganized arrangement. The exact cause is unknown, but they are believed to result from developmental anomalies during breast tissue formation. They are non-neoplastic and not caused by external factors like trauma or infection. Pathophysiology Hamartomas arise from an abnormal proliferation and organization of native breast tissue components. They contain varying proportions of adipose, fibrous, and glandular tissue , often surrounded by a thin pseudocapsule formed by compressed surrounding tissue. Some variants may contain: Smooth muscle (myoid hamartomas) Cartilage or bone (very rare) Despite the benign nature, rare malignant transformation has been reported (e.g., ductal c...