Figure 5: Relationship between postoperative Karnofsky performance status score (KPS) and tumor grade according to the proposed new classification system for craniopharyngiomas. Postoperative KPS decreases significantly with an increase in tumor grade. Mean postoperative KPS is 88.9 ± 13.3 for grade II (n=38), 87.6 ± 9.1 for grade III (n=45), 81.9 ± 19.7 for grade IV (n=16), and 50 for grade V (n=1). Gamma knife (GK) treatment (right lower panel) (preoperative; n=15, postoperative; n=13, total; n=28) or surgery in other institution (right upper panel: previous Op. in other institute; n=14) does not influence postoperative KPS score. GK+;GK treatment before or after surgery, GK- ; No GK treatment, Previous Op. in other institute; 1st operation done in other institution, Previous Op. (-); primary surgery done in our institution.