Abstract
An incidental diffuse low-grade glioma (DLGG) is a previously undetected and asymptomatic tumor at the time of imaging diagnosis that was unexpectedly discovered and unrelated to the purpose of the MR examination. The reported prevalence of incidental DLGGs ranges from 0.025 to 0.2 %. The occurrence of incidentally discovered DLGGs will increase in the future due to the rising frequency of brain imaging in addition to recent advances in imaging technology. Incidental DLGGs are progressive tumors that develop at a similar rate to those for the symptomatic DLGGs, and represent an earlier step than symptomatic DLGGs in the tumor natural course. Incidental diffuse gliomas can remain silent until malignant transformation occurs. Thus, incidental DLGGs should be considered as progressive tumors with the same potential for progression than that for symptomatic DLGGs. Because incidental DLGGs are not benign tumors and because the natural course of DLGGs during the silent and symptomatic periods are similar, incidental DLGGs should be managed as symptomatic DLGGs. Surgical resection of incidental DLGGs is feasible with a minimal morbidity and larger amount of resection can be carried out comparing with that from symptomatic DLGGs. These data argue for an early surgical treatment in asymptomatic patients to maximize the extent of DLGG resection before glioma growth and migration, even in critical brain regions. Hence, surgical removal with functional intraoperative mapping should be proposed as soon as progression is demonstrated on close imaging follow-up.
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Acknowledgments
Johan Pallud and Emmanuel Mandonnet want to thanks all the members of the French Glioma Network (REG, Réseau d’Etude des Gliomes) and particularly Hugues Duffau.
Johan Pallud wants to thank Bertrand Devaux and François-Xavier Roux of the department of Neurosurgery, Pascale Varlet and Fabrice Chrétien of the department of Neuropathology and Catherine Oppenheim and Jean-François Meder of the department of Neuroradiology of the Sainte-Anne Hospital Center, Paris, France.
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Pallud, J., Mandonnet, E. (2014). Surgical Management of Incidentally Discovered Diffuse Low-Grade Gliomas. In: Hayat, M. (eds) Tumors of the Central Nervous System, Volume 11. Tumors of the Central Nervous System, vol 11. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7037-9_11
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