What procedure is typically indicated for the removal of an obstruction within a duct?

The procedure that is typically indicated for the removal of an obstruction within a duct is dilation. Dilation involves widening the duct to allow for the passage of an obstruction, which may be especially useful in cases where a stricture or narrowing is causing the obstruction. This procedure is often performed using tools such as balloons or stents that can expand the duct's width, thereby alleviating the blockage without the need for more invasive surgery.

In contrast, while endoscopy can be used to visualize and sometimes address obstructions, it does not specifically mean removal and may not always lead to resolution of the obstruction itself. Resection refers to the surgical removal of a portion of tissue or organ and is more applicable when a section of the duct or surrounding tissue needs to be excised, not just cleared of an obstruction. Extraction typically refers to the removal of objects or substances from the body, but it is not the standard term used for the removal of obstructions specifically within ducts. Thus, dilation is the most appropriate choice for treating obstructions in this context.