A 23-year-old woman goes to her physician to ask about a tender lump in her left breast. She has no family history of cancer and is taking low-dose oral contraceptives. On exam, she has a 2-cm,...

A 23-year-old woman goes to her physician to ask about a tender lump in her left breast. She has no family history of cancer and is taking low-dose oral contraceptives. On exam, she has a 2-cm, rubbery, round, mobile mass.An ultrasound is performed showing a solid mass. Core needle biopsy produces a sample with benign-looking morphology. What characteristic is seen on the sample?

A. High nucleus to cytoplasm ratio

B. High fraction of cells with mitotic spindles

C. Loss of glandular structure

D. Cellular hyperplasia with glandular architecture

E. Anaplastic cells