Expanding the Imaging Spectrum of Polymorphous Low-Grade Neuroepithelial Tumor of the Young in Children

Common imaging features of pediatric PLNTY tumors. A–C, A 9-year-old boy (case 5) with a 1-month history of headaches. Coronal T2WI (A) and FLAIR (B) sequences show a vague area of increased signal intensity in the cortical-subcortical region of the right temporal lobe (arrows in A and B). Axial SWI shows a small calcification (C). D, An 11-year-old girl with seizures (case 1). Nonenhanced axial CT shows a focal lesion in the left temporal lobe with intralesional calcifications exhibiting a punctate calcification pattern (arrow). E–H, A 6-year-old girl with complex focal seizures (case 3). Axial T2WI (E) image depicts a mixed cortical-subcortical lesion with solid and cystic components in the right parietal lobe. Pre- and postcontrast axial T1 TSE (F and H) reveals mild postcontrast enhancement (arrows in E and F). Axial SWI (G) demonstrates a punctate pattern of calcification (arrow). I and J, A 4-year-old girl with a 4-year history of seizures (case 6). Axial T2* gradient-echo image (I) reveals an ill-defined lesion in the left parietal lobe with a large central susceptibility in keeping with a chunky central calcification (arrow). Coronal FLAIR image (J) shows a related high-signal-intensity area in the subcortical white matter extending toward the left lateral ventricle, consistent with a TLS (arrows). K and L, A 14-year-old boy with new-onset seizures (case 8). Coronal T2WI (K) shows a hyperintense lesion in the left parietal region (arrow). Coronal FLAIR (L) shows an associated high signal area extending medially, in keeping with a TLS (arrows).