Primary acinic cell carcinoma of the breast: A case report and review of literature

Figure 1 Ultrasound scan. A: An 11 mm × 7 mm hypoechoic mass in the upper inner quadrant of the right breast, regular in shape, with a distinct margin; B: Color Doppler imaging showed hypervascularity.

Figure 2 Mammography. A high-density mass in the upper inner quadrant of the right breast measuring 13 mm × 8 mm with indistinct margins (the white arrows indicate the location of the mass).

Figure 3 Histopathological findings. A: Hematoxylin and eosin (HE) staining (× 40); B: HE staining (× 100); C: HE staining (× 200); D: HE staining (× 400).

Figure 4 Immunohistochemical staining (× 100). A: Immunostaining for calponin; B: Immunostaining for Ki67 (1% positive); C: Immunostaining for P63; D: Immunostaining for PR.