title: Cribriform neuroepithelial tumor arising in the lateral ventricle.
abstract: Cribriform neuroepithelial tumor (CRINET) is a recently recognized central nervous system neoplasm that arises in the ventricles of young children and is characterized by primitive, non-rhabdoid SMARCB1-deficient cells with prominent cribriform architecture. We report a 14-month-old male who presented with signs of increased intracranial pressure. Neuroimaging revealed a large solid and cystic mass in the lateral ventricle. Tumor cells were small, primitive appearing, and arranged in cribriform and trabecular patterns with interspersed solid cellular areas. Rhabdoid cells were absent. Immunohistochemical staining showed no SMARCB1 (INI11, BAF47, hSNF5) expression and strong epithelial membrane antigen (EMA) immunoreactivity along luminal surfaces. Electron microscopy showed epithelial characteristics, including abundant basal lamina. Genetic analysis of the tumor revealed deletion of 1 SMARCB1 allele, while the other contained an intronic point mutation predicted to disrupt splicing. This case further illustrates the distinct histopathologic and molecular genetic features of CRINET and identifies distinctive ultrastructural features.
authors.affiliation: Department of Pathology and Laboratory Medicine, Ohio State University College of Medicine, Columbus, OH, USA.
authors.forename: Michael A
authors.initials: MA
authors.lastname: Arnold
authors.forename: Kandi
authors.initials: K
authors.lastname: Stallings-Archer
authors.forename: Evan
authors.initials: E
authors.lastname: Marlin
authors.forename: Ronald
authors.initials: R
authors.lastname: Grondin
authors.forename: Randal
authors.initials: R
authors.lastname: Olshefski
authors.forename: Jaclyn A
authors.initials: JA
authors.lastname: Biegel
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Pierson
mesh_terms: D000971:Antineoplastic Combined Chemotherapy Protocols; D002551:Cerebral Ventricle Neoplasms / Q000235:genetics / Q000473:pathology* / Q000628:therapy; D002868:Chromosomal Proteins, Non-Histone / Q000235:genetics; D003131:Combined Modality Therapy; D004268:DNA-Binding Proteins / Q000235:genetics; D006801:Humans; D007150:Immunohistochemistry; D007223:Infant; D020547:Lateral Ventricles / Q000473:pathology; D008297:Male; D046529:Microscopy, Electron, Transmission; D060885:Multiplex Polymerase Chain Reaction; D018302:Neoplasms, Neuroepithelial / Q000235:genetics / Q000473:pathology* / Q000628:therapy; D019635:Neurosurgical Procedures; D000071796:SMARCB1 Protein; D014157:Transcription Factors / Q000235:genetics
chemical_list: D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins; D000071796:SMARCB1 Protein; C513266:SMARCB1 protein, human; D014157:Transcription Factors