What instrument is typically used for retracting skin during a mastectomy?

The Berens retractor is specifically designed to provide effective retraction of the skin and soft tissue during a mastectomy. Its shape and design allow surgeons to maintain a clear view of the surgical area while minimizing trauma to the surrounding tissues. This is essential during such a procedure to ensure adequate exposure and to facilitate the careful dissection required to remove breast tissue while preserving important structures.

The other instruments listed serve different purposes or may not be as effective for the specific requirements of skin retraction in a mastectomy. For example, the Army-Navy retractor is more commonly used for abdominal or thoracic surgeries, and while it can be used for skin retraction, it may not offer the same stability or control as the Berens retractor. The Deaver retractor is primarily used for deeper tissue retraction and is typically used in larger incisions. Allis forceps are designed for grasping tissues and are not primarily intended for retraction. Therefore, the Berens retractor stands out as the most appropriate choice for skin retraction during a mastectomy.