What CT features are typical of renal cell carcinoma?

What CT features are typical of renal cell carcinoma?

• A. Non-enhancing cyst with uniform density
• B. Enhancing solid renal mass with irregular margins and possible invasion into renal vein
• C. Simple cyst with smooth border
• D. Limited enhancement with homogeneous texture

Answer: (B)

Renal cell carcinoma on CT is best recognized as a solid, enhancing renal mass with irregular, infiltrative margins, and it can invade the renal vein. This pattern reflects a vascular, malignant tumor that tends to widen and irregularize its border as it grows and may extend into nearby vessels, which is a key feature used for staging and planning treatment. After contrast, the lesion typically shows enhancement compared with the surrounding kidney parenchyma, and it is often heterogeneous due to areas of necrosis or hemorrhage, rather than being a uniform, non-enhancing structure. Non-enhancing or uniformly density cysts describe benign simple cysts, which appear without post-contrast enhancement and usually have smooth, well-defined walls. A lesion that shows limited, homogeneous enhancement would be less typical of RCC, which tends to be heterogeneous because of internal necrosis and varying vascularity.

Renal cell carcinoma on CT is best recognized as a solid, enhancing renal mass with irregular, infiltrative margins, and it can invade the renal vein. This pattern reflects a vascular, malignant tumor that tends to widen and irregularize its border as it grows and may extend into nearby vessels, which is a key feature used for staging and planning treatment. After contrast, the lesion typically shows enhancement compared with the surrounding kidney parenchyma, and it is often heterogeneous due to areas of necrosis or hemorrhage, rather than being a uniform, non-enhancing structure.

Non-enhancing or uniformly density cysts describe benign simple cysts, which appear without post-contrast enhancement and usually have smooth, well-defined walls. A lesion that shows limited, homogeneous enhancement would be less typical of RCC, which tends to be heterogeneous because of internal necrosis and varying vascularity.