Fig. 1.

Normal pregnancy and lactational change: a 39-year-old woman, lactating for 3 months. a Note the larger breast size and increased density of parenchyma in spite of pumping prior to imaging on right MLO view compared with b, reduced density of parenchyma on mammogram performed prior to pregnancy. c Pregnancy change: a 38-year-old woman, 24 weeks pregnant presents with breast pain. Note diffuse hypoechogenicity due to enlargement of non-fatty fibroglandular components during pregnancy. d Increased echogenicity with ductal prominence, which is typical appearance of a lactating breast on grey-scale ultrasound