Résumé : We report a case of diastematomyelia associated with epidermoid cysts. On initial 1.5 T MRI the diagnosis of multicystic tumor or cysticercosis in the cauda equina was considered. A careful examination of the initial MRI and additional 3 T MRI raised the possibility of diastematomyelia associated with epidermoid intramedullary cysts (confirmed on diffusion weighted imaging). This information was very important for the surgeon in order to avoid an unnecessary exploration of an already compromised spinal cord. © 2010 Elsevier Ireland Ltd. All rights reserved.