What type of patients is most often treated with radiofrequency ablation?

Radiofrequency ablation is a minimally invasive medical procedure that is primarily used to treat localized tumors. This technique involves the application of heat generated by radiofrequency energy to destroy cancerous cells in specific areas, making it particularly effective for tumors that are well-defined and localized.

Localized tumors are typically those that have not spread significantly beyond their original site, allowing for a targeted approach that minimizes damage to surrounding healthy tissue. This makes radiofrequency ablation an attractive option in oncology, particularly for tumors in organs such as the liver, kidneys, and lungs.

The other options pertain to different categories of medical conditions that are not primarily treated with this technique. Chronic infections and systemic diseases would generally require other therapeutic strategies, while routine screening does not involve treatment processes like ablation. Thus, the focus on localized tumors distinguishes this choice as the correct answer for the application of radiofrequency ablation.