Magnetic resonance imaging diagnosis of dysembryoplastic neuroepithelial tumor in children / 中华实用儿科临床杂志

ABSTRACT

Objective To study magnetic resonance imaging(MRI) features of dysembryoplastic neuroepithelial tumor(DNT) and to improve accurate diagnosis of DNT.Methods The MRI appearance and clinical features of 10 patients with DNT confirmed by surgery and pathology were analyzed retrospectively.Results In 10 cases,9 tumors located in supratentorial hemisphere cortex,3 tumors located in the temporal lobe,5 in the frontal lobe,1 in the parietal lobe,and 2 of them encroached the adjacent white matter.In 9 tumors located in supratentorial hemisphere cortex,8 cases had decreased signal intensity on T1-weighted MR images,1 case iso-decreased mixed signal intensity on T1-weighted MR images,and 9 cases increased signal intensity on T2-weighted images,9 cases slightly increased signal intensity on fluid attenuated inversion recovery weighted images.The manifestation of tumors was cystic or cystic partially oriented and was seen separate section intratumoral in some cases.Three cases appeared as hyperintense ring sign and internal septation,2 cases appeared as a triangle in shape,3 cases appeared as gyms-like shape,and 1 case as round shape,similar to cyst.Nine tumors had no significant mass effect and peritumoral edema.Enhanced MR imaging showed only 1 case with slight and heterogeneous enhancement,the rest 6 cases showed non enhancement.One case located in cerebellar hemisphere,and appeared cystic-solid mass,the solid part had decreased signal intensity on T1-weighted MR images,and increased signal intensity on T2-weighted images,the cystic part had decreased signal intensity on T1-weighted MR images,and increased signal intensity on T2-weighted images.On enhanced MR imaging,the wall-node obviously contrast enhancement,cyst wall slightly contrast enhancement,cystic part non enhancement.The tumor had peritumoral edema and mass effect.Ten cases had no hemorrhage and calcification.Conclusion The MRI appearance of DNT is characteristic and is helpful for the preoperative diagnosis of DNT.