“…Historically, quality assurance by the reference radiology and radiation oncology panel of the GHSG has proven to enhance both accuracy in diagnostic and therapy for HL. 11 , 12 , 14 The main reason for major deviations still lie within an inadequate coverage of an involved region which is in accordance with the literature. 11 , 12 A detailed recurrence analysis of the HD 16 trial showed that infield relapses constitute the major pattern of failures if RT is omitted in the treatment.…”