What structure should be mobilized to approach the right adrenal gland anteriorly?

To approach the right adrenal gland anteriorly in a surgical context, mobilizing the hepatic flexure of the colon along with the right colon is essential. This is due to the anatomical position of the right adrenal gland, which is located superior to the right kidney and in close proximity to the structures of the right upper quadrant, including the liver and the right colon.

By mobilizing the hepatic flexure and the right colon, the surgeon can gain adequate access and a better visual field to safely navigate to the right adrenal gland. This mobilization helps in minimizing the manipulation of surrounding tissues, which is crucial for reducing post-operative complications and facilitating a direct approach.

The other anatomical structures listed, such as the stomach, duodenum, and ascending colon, do not provide the same level of access or mobility needed for a safe and effective approach to the right adrenal gland. Each of these structures has different anatomical relationships and does not assist as effectively in accessing the adrenal gland, making the mobilization of the hepatic flexure and right colon the most appropriate choice for this surgical endeavor.