CT features of calcification in abdominal neuroblastoma

The plan radiographs and computed tomography (CT) scans of 12 children with abdominal neuroblastoma were reviewed to evaluate the incidence and shape of calcification in the tumor. Calcifications were detected in 7 cases by plain radiographs and in 10 by CT. Small dotted and thin ring calcifications were better shown by CT. Ring calcification does not appear to be as rare as has been reported. It is emphasized that all ring calcifications in the vicinity of adrenal glands are not benign.