Neurocytomes centraux: corrélations cliniques et radiopathologiques à propos de 12 observations

Central neurocytomas are defined as neoplasms composed of round, uniform cells, with neural immunophenotypic profile and low proliferation index. They account for 0.5% of intracranial tumors. They usually occur near the foramen of Monro and can cause obstructive hydrocephaly. We conducted a retrospective data collection from records of 12 patients with central neurocytomas in the Anatomopathological Laboratory at the Mohammed VI University Hospital, Marrakech, between January 2006 and June 2015. This study aimed to report and describe the radiopathological features of this rare histologic type. The male/female sex-ratio was 1.4. The average age at diagnosis was 22.3 years. The revealing symptomatology was dominated by intracranial hypertension associated with decreased visual acuity and diplopia in all patients. Our study concerned about simple biopsy in one case, subtotal resection in seven cases and total resection in four cases. Histopathological examination showed tumor proliferation with endocrine architecture. Tumor cells are more often small and uniform. Mitotic index was low. Tumor proliferation was associated with fibrillary fundus and vascular network with three types of trees. Immunohistochemical examination was identical in all patients. It showed tumor cells positive for anti-synaptophysin antibodies, chromogranine and NSE. In all patients the radio-pathologic correlation suggested central neurocytoma (grade II - WHO 2016). This study highlights the anatomo-clinical, radiological and evolutionary features of these rare tumors.