Objective To investigate the effects and adverse reactions of postoperative three-dimensional conformal radiotherapy(3D-CRT)in a dose of 30 Gy plus chemotherapy for different stages of medulloblastoma.Methods Fifty-six patients with medulloblastoma were divided in low-risk group(n=22)and high-risk group(n=34).Both groups received3D-CRT and adjuvant chemotherapy after operation,and were observed the therapeutic effect and adverse reactions.Results The 5-year survival rate and the mean survival time were 81.8...