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

## TL;DR

A rare brain tumor case is reported where the tumor was entirely solid and located in the subcortical white matter, offering new diagnostic clues.

## Contribution

The report presents a unique PGNT case with a purely solid pattern and a low-signal rim on imaging.

## Key findings

- PGNT was found in subcortical white matter with no cystic component.
- A low-signal intensity rim on susceptibility-weighted imaging was observed.
- This imaging feature may help distinguish PGNT from similar tumors.

## Abstract

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.