MR imaging of a rare case of primary central nervous system lymphoma i
n a 12-year-old boy with headache and seizure is presented. MR imaging
showed a mass lesion located in the corpus callosum. Diagnosis was ma
de by stereotactic biopsy. The patient was treated with radiotherapy.
Early control MR imaging showed a decrease in tumor size but after 12
months an increase in tumor size was detected.