“…4 A variety of prognostic factors has been reported for skull base chordomas, including the degree of surgical resection, tumor size, preoperative Karnofsky Performance Status, type of adjuvant radiation therapy, prior surgical and radiation history, and tumor pathology. 7,[12][13][14][15][16][17][18][19][20][21][22][23] Three pathologic subtypes have been identified-conventional, chondroid, and dedifferentiated-with conventional chordomas the most common and dedifferentiated chordomas the least common and having the least favorable prognosis. 12,20,22,24 Other factors, such as age and sex, have demonstrated variable associations with outcome.…”