Papillary Glioneuronal Tumor Located in the Subcortical White Matter With a Purely Solid Pattern: A Case Report

Papillary glioneuronal tumor (PGNT) is a rare brain tumor classified as a CNS WHO grade 1 tumor. It commonly occurs in the periventricular white matter and typically presents as a well-circumscribed mass composed of both cystic and solid components. In this report, we present a rare case of PGNT arising in the subcortical white matter and consisting entirely of solid components. Notably, a low-signal intensity rim was observed at the tumor margins on susceptibility-weighted imaging, a feature previously reported in PGNT. This finding may have diagnostic significance, as it could help differentiate PGNT from other tumors with overlapping imaging features, such as ganglioglioma, pleomorphic xanthoastrocytoma, and brain metastasis.