Wedge resection is a surgical procedure to remove a triangle-shaped slice of tissue. It may be used to remove a tumor

Tumor

A tumor or tumour is commonly used as a synonym for a neoplasm that appears enlarged in size. Tumor is not synonymous with cancer...

or some other type of tissue that requires removal and typically includes a small amount of normal tissue around it.
It is easy to repair, does not greatly distort the shape of the underlying organ and leaves just a single stitch line as a residual.

External links

• Wedge resection entry in the public domain NCI Dictionary of Cancer Terms