The most common problem that an aneurysmal bone cyst will cause is weakening of the bone. This may lead to increased susceptibility to fracture at that location. Because of this, the bone cyst may need to be treated in the operating room to prevent a fracture. Sometimes the bone cyst will not be found until after a fracture has happened. In this case, treatment of the fracture will also include treatment of the bone cyst to prevent a recurrence of this problem.