[Value of diagnostic imaging for assessment of unsuccessful treatment of children with neoplastic diseases. Introductory comments based on personal examinations].

Diagnostic imaging has determined clinical application depending on kind of pathology and anatomical localisation. This is a precise and fine instrument for monitoring effects of treatment in childhood malignant tumours. Authors demonstrate examples of cases in which diagnostic imaging was the only method which revealed a relapse in situ, progression during chemotherapy or clinically unsuspected dissemination of tumours after many years.