Purpose: To correlate targeting deviation in external beam radiation therapy with site of
relapse in a prospective study of 174 patients treated for medulloblastoma. Methods and
Materials: Between February 1992 and February 1998 the radiotherapy treatment records
were reviewed by a panel of radiation oncologists for 174 children treated with radiation
therapy for medulloblastoma. The review was done without knowledge of patient outcome.
Patterns of relapse were correlated with the results of the quality control review. Results …