Pediatric infratentorial ganglioglioma.
OBJECTIVE
Pediatric infratentorial gangliogliomas are exceedingly rare tumors; thus, the factors affecting their outcome are poorly understood and their optimal management has still to be defined.


METHODS
We reviewed the literature on pediatric gangliogliomas with a focus on those located in the posterior fossa to study treatment and outcome data. We added to this review some of our clinical cases.


RESULTS
We found 100 and 80 cases of brainstem and cerebellar pediatric ganglioglioma, respectively, in our literature review. The surgical management varied from biopsy to gross total resection, and adjuvant treatment was given after incomplete resection or at time of progression. A gross total resection should be attempted to remove the contrast enhancing part of the tumor, which may be possible in most of the cerebellar gangliogliomas and some of the brainstem lesions. The cervicomedullary ganglioglioma seems to be the most infiltrative and least amenable to complete resection. Chemotherapy has a limited role and BRAF mutation was reported in 38 to 54 % of cases. The use of radiotherapy exposes the patient to a risk of malignant transformation and should be reserved for unresectable tumors which progress.


CONCLUSIONS
Pediatric posterior fossa gangliogliomas are rare and challenging tumors due to their frequent infiltrative component involving the brainstem. To date, adjuvant therapy has a limited role that may evolve with time thanks to the use of targeted therapies against BRAF mutation. The surgical resection of well-defined contrast enhancing parts should be attempted even in staged surgeries and balanced with the risks of neurological deterioration.
Department of Pediatric Neurosurgery, Necker Enfants Malades Hospital, 149 rue de Sèvres, 75015, Paris, France. stephanie.puget@gmail.com.|APHP, Université Paris Descartes, Sorbonne Paris Cité, France. stephanie.puget@gmail.com.|Department of Pediatric and Adolescent Oncology and CNRS UMR 8203 "Vectorology and Anticancer Therapeutics," Gustave Roussy Cancer Institute, Universite Paris Sud, 114 rue Edouard Vaillant, 94805, Villejuif, France. stephanie.puget@gmail.com.
Stephanie
S
Puget
Department of Pediatric Neurosurgery, Necker Enfants Malades Hospital, 149 rue de Sèvres, 75015, Paris, France.|APHP, Université Paris Descartes, Sorbonne Paris Cité, France.
Awad
A
Alshehri
Department of Pediatric Neurosurgery, Necker Enfants Malades Hospital, 149 rue de Sèvres, 75015, Paris, France.|APHP, Université Paris Descartes, Sorbonne Paris Cité, France.
Kevin
K
Beccaria
Department of Pediatric Neurosurgery, Necker Enfants Malades Hospital, 149 rue de Sèvres, 75015, Paris, France.|APHP, Université Paris Descartes, Sorbonne Paris Cité, France.
Thomas
T
Blauwblomme
Department of Pediatric Neurosurgery, Necker Enfants Malades Hospital, 149 rue de Sèvres, 75015, Paris, France.|APHP, Université Paris Descartes, Sorbonne Paris Cité, France.
Giovanna
G
Paternoster
Department of Pediatric Neurosurgery, Necker Enfants Malades Hospital, 149 rue de Sèvres, 75015, Paris, France.|APHP, Université Paris Descartes, Sorbonne Paris Cité, France.
Syril
S
James
Department of Pediatric Neurosurgery, Necker Enfants Malades Hospital, 149 rue de Sèvres, 75015, Paris, France.|APHP, Université Paris Descartes, Sorbonne Paris Cité, France.
Federico
F
Dirocco
Department of Pediatric and Adolescent Oncology and CNRS UMR 8203 "Vectorology and Anticancer Therapeutics," Gustave Roussy Cancer Institute, Universite Paris Sud, 114 rue Edouard Vaillant, 94805, Villejuif, France.
Christelle
C
Dufour
Department of Pediatric Neurosurgery, Necker Enfants Malades Hospital, 149 rue de Sèvres, 75015, Paris, France.|APHP, Université Paris Descartes, Sorbonne Paris Cité, France.
Michel
M
Zerah
Department of Neuropathology, Sainte-Anne Hospital, 1 rue Cabanis, 75014, Paris, France.
Pascale
P
Varlet
Department of Pediatric Neurosurgery, Necker Enfants Malades Hospital, 149 rue de Sèvres, 75015, Paris, France.|APHP, Université Paris Descartes, Sorbonne Paris Cité, France.
Christian
C
Sainte-Rose
D018303:Ganglioglioma / Q000175:diagnosis / Q000628:therapy; D006801:Humans; D015192:Infratentorial Neoplasms / Q000175:diagnosis / Q000628:therapy; D010372:Pediatrics
Brainstem; Cerebellum; Ganglioglioma; Pediatric; Posterior fossa