Nervous System- Tumor and Tumor-like lesion I

Question No. 2. The Answer is: (D) Medulloepithelioma.

Discussion: The epithelial architecture of this tumor (left panel) recapitulates the earliest developmental stage, that is the epithelial stage of the neuroectoderm. Such epithelial architecture is demonstrated by a Jones stain which demonstrates the presence of basement membrane on only one side of the tumor cells (arrow in the right panel).