Clinicopathological study of recently added glioneuronal tumors

Background: Glioneuronal tumors are pathologically heterogeneous group of tumors containing both glial and neural components or glial tumors with neural differentiation. In the year 2007, three new entities have been added to the repertoire of glioneuronal tumors by the World Health Organization (WHO) which include papillary glioneuronal tumor (PGNT) (WHO Grade I), rosette-forming glioneuronal tumor of the fourth ventricle (RGNT) (WHO Grade I), and glioneuronal tumor with neuropil-like islands (GTNIs) (WHO grade II/III). The present study summarizes the clinical and neuropathological features of these three glioneuronal neoplasms. Materials and Methods: This study included seven cases of newer glioneuronal tumors (four cases of PGNT, two cases of RGNT, and one case of GTNI) which were reviewed. Results: The clinical presentations (patient characters), radiology, squash preparations, histology, and immunohistochemical findings of these cases are discussed including some of the morphological variations and follow-up. Conclusion: Glioneuronal tumors show considerable morphological and clinical diversity with some unique features. As these neoplasms are low grade and well manageable, the knowledge of their clinical presentation and histological diagnosis is essential for treatment. The present study is an attempt toward this.