Subependymal giant cell astrocytoma (SEGA): Is it an astrocytoma? Morphological, immunohistochemical and ultrastructural study.
Subependymal giant-cell astrocytoma (SEGA) is a rare intra-ventricular low-grade tumor which frequently occurs as a manifestation of tuberous sclerosis complex. The histogenesis of SEGA is controversial and its astrocytic nature has been doubted. First studies suggested the astrocytic nature of SEGA while several recent reports demonstrate its glio-neuronal nature. In spite of this, in the recently revised WHO classification of the CNS tumors, SEGA has been still included in the group of astrocytomas. We studied nine tuberous sclerosis complex-associated SEGAs. Patients were 1-18 years old. Eight patients (89%) had a solitary lesion located in the lateral ventricle close to of the head of the caudate nucleus, the remaining patient (11%) had two tumors, one located close to the head of the left caudate nucleus and the other in the central part of the right lateral ventricle. Histologically, tumors were composed of three types of cells: spindle, gemistocytic and ganglion-like. Four tumors (44%) had a prominent vascularization and three (33%) showed an angiocentric pattern. Calcifications were observed in six cases (66%). By immunohistochemistry, the majority of the tumors were GFAP- (9; 100%), neurofilament- (8, 89%), neuron-specific enolase- (9, 100%), and synaptophysin- (8; 89%) positive. Ultrastructural studies were performed on four cases. In all four there were glial cell processes filled with intermediate filaments. In one case dense core putative neurosecretory granules were appreciable. Our results emphasize the glio-neuronal nature of SEGA. We suggest moving it into the group of mixed glio-neuronal tumors under the denomination of subependymal giant cell tumor.
Buccoliero
Anna M
AM
Department of Human Pathology and Oncology, University of Florence, Italy. ambuccoliero@unifi.it
Franchi
Alessandro
A
Castiglione
Francesca
F
Gheri
Chiara F
CF
Mussa
Federico
F
Giordano
Flavio
F
Genitori
Lorenzo
L
Taddei
Gian L
GL
D000293:Adolescent; D001254:Astrocytoma / Q000737:chemistry / Q000145:classification / Q000473:pathology* / Q000648:ultrastructure; D001932:Brain Neoplasms / Q000737:chemistry / Q000145:classification / Q000473:pathology / Q000648:ultrastructure; D002551:Cerebral Ventricle Neoplasms / Q000737:chemistry / Q000145:classification / Q000473:pathology / Q000648:ultrastructure; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007223:Infant; D007382:Intermediate Filaments / Q000648:ultrastructure; D008297:Male; D009378:Neoplasms, Multiple Primary / Q000737:chemistry / Q000473:pathology* / Q000648:ultrastructure; D009419:Nerve Tissue Proteins / Q000032:analysis; D016900:Neurofilament Proteins / Q000032:analysis; D009457:Neuroglia / Q000473:pathology / Q000648:ultrastructure; D010751:Phosphopyruvate Hydratase / Q000032:analysis; D016708:Synaptophysin / Q000032:analysis
D009419:Nerve Tissue Proteins; D016900:Neurofilament Proteins; D016708:Synaptophysin; D010751:Phosphopyruvate Hydratase