• Paolo A Bolognese, Andrew Brodbelt, Alexander B Bloom, and Roger W Kula.
• Chiari Neurosurgical Center, Lake Success, New York, USA; Mount Sinai South Nassau, Division of Neurosurgery, Oceanside, New York, USA. Electronic address: pbolognese@chiarinsc.com.
• World Neurosurg. 2020 Aug 1; 140: e14-e22.

BackgroundChiari I Malformation (CMI) and the topics concerning it have been the subject of numerous discussions and polarizing controversies over the course of the past 20 years.MethodsThe opinions of 63 recognized international Neurosurgical CMI experts from 4 continents, with a collective surgical experience of more than 15,000 CMI cases, were gathered through a detailed questionnaire, divided in two parts: diagnostic and therapeutic. The therapeutic part was organized into four sections: Professional Profile, Technical Preferences, Surgical Opinions, and Clinical Scenarios.ResultsThe data reflected a wide spectrum of opinions, approaches, and expertise. The second part of the questionnaire dealt with the surgical aspects of CMI care and painted a more complex picture: • 81% of the surgeons preferred the Intradural technique. • 88% of the experts agreed that CMI surgery is not indicated for minimal non-debilitating symptoms alone, or as prophylaxis. • In the face of given clinical scenarios, a wide spectrum of therapeutic approaches was chosen by the whole group, but the 4 Surgeons with the largest case series expressed the same opinion. • Eight out of 63 Surgeons had a surgical experience above 600 cases, were responsible for more than half of the total 15,000 declared CMI cases, and shared a similar profile in terms of technical surgical choices, therapeutic opinions, and low complication rate, with a marked preference for Intradural techniques and tonsillar manipulation. • Once large individual case series were accumulated, we did not see any differences in the opinions and preferences between Adult and Pediatric Neurosurgeons.ConclusionSurgeons who have focused on CMI have been able to accumulate large surgical series, have chosen in their practices the more aggressive (and intrinsically more effective) CMI surgical techniques, and have achieved a low complication rate which compares favorably with that one of the extradural techniques.Copyright © 2020 Elsevier Inc. All rights reserved.

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