Fig. 5. 5. Granulomatous lobular mastitis in 38-year-old woman presenting as painful mass in left breast.

A. Transverse ultrasonography image shows irregular hypoechoic lesion. B. Photomicrograph (hematoxylin and eosin stain, × 100) demonstrates granulomatous inflammation that is centered on lobules with lymphocytes, plasma cells, epithelioid histiocytes, and multinucleated giant cells.