The number of cc's is very individual. A buffalo hump can be a localized fatty pad, but it can also include dense fibrous fat, posture or spine shape, and occasionally medical factors such as steroid use or endocrine conditions. Because of that, the removable volume cannot be predicted accurately without an exam. In many patients the amount removed from this area is modest compared with larger areas such as the abdomen or flanks. The goal should be a smoother neck and upper back contour, not chasing a specific number of cc's. Removing too aggressively can create dents, looseness, contour irregularity, or skin problems. A plastic surgeon should examine the thickness of the fatty layer, skin quality, neck and shoulder contour, and your medical history. If the area is mostly fat, liposuction may help. If it is very dense or fibrous, special techniques or, rarely, limited excision may be discussed. If an underlying medical cause is contributing, treating that issue is important to reduce the chance of recurrence. The best next step is an in-person consultation with a board-certified plastic surgeon who can give you a realistic estimate and show examples of similar cases.