The phrase "to remove the mass" means to eliminate or get rid of a large quantity or amount of something. It refers to the action of taking away or reducing a significant bulk or volume of a particular substance or object. Full definition
Anyone who has been through this with their own dog might know that most of the time, removing a mass on the heart is not possible. (tulsapetsmagazine.com)
In some cases it may be possible to remove the mass while retaining a normally functioning eye (Figure 3). (vetmed.ucdavis.edu)
In order to completely remove mass lesions, a surgeon needs a clear view of the large bowel's anatomy. (vetmed.ucdavis.edu)