Which description best matches a tumor with a high nucleus-to-cytoplasm ratio and prominent nucleoli?

• A. Low grade
• B. Moderate grade
• C. Benign
• D. High grade

Answer: (D)

In tumor grading, a high nucleus-to-cytoplasm ratio and prominent nucleoli signal poor differentiation and aggressive behavior. When cells become less specialized, their nuclei enlarge relative to the cytoplasm, so the N:C ratio goes up. Prominent nucleoli indicate active ribosomal production and high transcriptional activity, which supports rapid cell growth. These features are hallmarks of high-grade tumors, which tend to be more invasive and have a higher likelihood of spreading compared with less differentiated forms.

Benign tumors are usually well differentiated, with a lower N:C ratio, inconspicuous nucleoli, and orderly, noninvasive growth. A low- to moderate-grade tumor would show some degree of differentiation and mitotic activity but not the marked atypia seen in high-grade lesions.