Which surgical instrument is typically used for the dissection of a breast tumor?

The Metzenbaum scissors are specifically designed for precise and delicate dissection, making them ideal for the dissection of soft tissues, such as breast tissue during a tumor removal procedure. Their long, thin blades enable surgeons to work in tight spaces and navigate around sensitive structures without causing unnecessary trauma, which is crucial when excising a tumor while preserving as much surrounding healthy tissue as possible.

In contrast, Potts scissors are primarily used for cutting in vascular surgeries, particularly for creating and enlarging incisions in blood vessels. The electrosurgical unit is used for cutting and coagulating tissue through the application of an electric current rather than for manual dissection. The #11 blade, typically utilized for making incisions, does not possess the ability to perform the nuanced cutting and dissecting necessary during tumor excision, particularly in intricate areas like the breast. Therefore, the Metzenbaum scissors are the most suitable instrument for this specific surgical task.