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Primary intracranial Ewing sarcoma/ peripheral primitive neuroectodermal tumor, an entity of unacquaintance: a series of 8 cases

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A Correction to this article was published on 19 September 2020

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Abstract

Purpose

The purpose is to highlight the primary intracranial (meningeal-based) occurrence of Ewing sarcoma/primitive neuroectodermal tumor (ES/PNET).

Methods

This report is a collation of clinicopathological features of eight cases of molecularly and clinicoradiologically confirmed primary (non-metastatic) intracranial (non-osseous) meningeal ES/PNET.

Results

The age range was 1 to 33 years with a median age of 9 years. Male to female ratio was 0.6:1. All patients were diagnosed on the debulking surgical material (gross total resection, 2 cases; subtotal resection, 6 cases) and showed primitive embryonal histomorphology with diffuse membranous CD99 immunoexpression and EWSR1 gene rearrangement by fluorescence in situ hybridization. Seven of them showed a typical FISH pattern of split signals with break-apart probe, while one showed an unusual signal pattern of loss of green signals. EFT-2001 adjuvant protocol was followed along with focal radiotherapy (RT) in all cases (except case 8, full course of chemotherapy could not be completed). Two cases had local recurrence—one of them died of disease recurrence before the administration of further treatment.

Conclusion

This series adds non-osseous intracranial site to the list of uncommon sites of occurrence for ES/PNET and more importantly emphasizes the need to be considered in a differential list of primary intracranial primitive embryonal tumors before embarking as primary central nervous system (CNS) embryonal tumor, NOS.

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Acknowledgments

The authors like to acknowledge Mr. Sandeep Dhanwade and Mr. Vinayak Kadam for their technical assistance.

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Contributions

Conceived, interpretation (cases diagnosed), facilitation of retrieving the relevant data, drafting, and final editing by Dr. Sridhar Epari; gathering the clinical data and interpretation of certain laboratory findings by Dr. Gauri Deshpande (for the cases 5–8) and Dr. Chavvi Gupta (for the cases 1–4); contribution in preparing the initial draft by Dr. Gauri Deshpande, partly assisted by Dr. Chavvi Gupta; scientific contributions by Dr. Omshree Shetty and Ms. Mamta Gurav; clinical and therapeutic contributions provided by Dr. Girish Chinnaswamy, Dr. Aliasgar Moiyadi, and Dr. Tejpal Gupta. All the authors have read the manuscript and concurred with the findings.

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Correspondence to Sridhar Epari.

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All the authors have no conflict of interest to disclose.

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This is an observational report made by retrieving the cases from archives and anonymizes all the details of the patients. Thus, this has been granted review exemption from institutional ethics committee.

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Due to an internal mistake during production the name of one of the co-authors, Aliasgar Moiyadi, was omitted from the original publication. With this Erratum the name of the co-author is included again and the original publication has been modified accordingly. SpringerNature apologizes for this and for any inconvenience associated therewith.

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Deshpande, G., Epari, S., Gupta, C. et al. Primary intracranial Ewing sarcoma/ peripheral primitive neuroectodermal tumor, an entity of unacquaintance: a series of 8 cases. Childs Nerv Syst 37, 839–849 (2021). https://doi.org/10.1007/s00381-020-04850-w

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