1. Montreux Suisse Juin 2013. 2nd congress of the Swiss Federation of Neuro-Society (Federation of Clinical Neuro-Sociities). Pediatric epilepsy surgery: the sooner, the better. B.Jenny, N.Smoll, Y.El Hassani, S.Vuillemoz, S.Momjian, C.Pollo, C.Korff, M.Seeck, K.Schaller.
2. Lugano Suisse Mai 2012. Annual meeting of the Swiss Society of Clinical NeurophysiologySSNC, 187th meeting Swiss Society of Neurology SSN. Seizure control after epilepsy surgery: Experience in young children and adolescents. B.Jenny, Y.El Hassani, S.Momjian, C.Pollo, M.Seeck, K.Schaller.
3. Sydney Australie Septembre 2012. 40th Annual Meeting of International Society of Pediatric Neurosurgery (International Society for Pediatric Neurosurgery). Seizure control after epilepsy surgery: Experience in young children and adolescent. B.Jenny, Y.El Hassani, S.Momjian, C.Pollo, M.Seeck, K.Schaller
4. Amsterdam Hollande Mai 2012 : 23rd meeting of the European Society of Pediatric Neurosurgery (ESPN): Seizure control after epilepsy surgery: experience in young children and adolescents. B.Jenny, Y.El Hassani, S.Momjian, C.Pollo, M.Seeck, K.Schaller
5. Paris, France Décembre 2010. Meeting Society of neurosurgery of French language . Postoperative neuropsychological prognosis of extra-temporal epilepsies. Y.El Hassani, A. Pegna, C.Pollo, S.Momjian, M.Seeck, K. Schaller.
6. Lausanne, Suisse Février 2010.14th Annual Cerebrovascular Working Group Switzerland: Clinical outcome of patients suffering intracranial aneurysms recruited prospectively and consecutively in Geneva. P.Bijlenga, V-M Pereira, Y.El Hassani, Y.Gasche, K.Lovblad, K.Schaller
7. Paris, France Novembre 2009. Meeting Society of neurosurgery of French language: Combined operating room with intraoperative and rotational angiography: a technical note on the Geneva experience. P. Bijlenga, M Kotowski, B Schatlo, I Radovanovic, S Momjian, L Slegers, O Brina, D Rufenacht, K. Schaller
8. Alger, Algérie Mai 2009. Congress Neurosurgery society french language: Syringomyelia symptomatic revealed 23 years after the treatment of a medulloblastoma and a scaphocephaly: About a case. Y.El Hassani, K.Burkhardt, J.Delavellle, M.Vargas, C.Boex, B.Rilliet.
1. Mainz Allemagne Septembre 2013: 41st Annual Meeting of International Society of Pediatric Neurosurgery(International Society for Pediatric Neurosurgery) Proteus syndrome revealing itself after the treatment of a bilateral subdural hemantoma. Y.El Hassani, K.Schaller, B.Jenny, B.Pittet-Cuenod, A.Bottani, P.Scolozzi, H.Ozsahin Ayse, B.RIlliet
2. Mainz Allemagne Septembre 2013: 41st Annual Meeting of International Society of Pediatric Neurosurgery ( International Society for Pediatric Neurosurgery) Intraoperative continuous interictal epileptiform discharge rate during functional hemispherotomy in children B.Jenny, R.Tyrand, S.Momjian, Y.El Hassani, M. Seeck, Karl Schaller, C. Boëx
3. Sydney Australie 2012. 40th Annual Meeting of the International Society of Pediatric Neurosurgery (International Society for Pediatric Neurosurgery) Hemostasis issues during peri-insular hemispherotomy for hemimegalencephaly: the report of 2 cases. B.Jenny, Y.El Hassani, S.Momjian, W.Habre, C.Korff, M.Seeck, K.Schaller
4. Amsterdam Hollande Mai 2012 : 23rd Meeting of the European Society of Pediatric Neurosurgery (ESPN): Occipital sinus pericranii associated with craniosynostosis: a report of two casesM. Zenobi, B. Jenny, Y. El Hassani, B. Pittet, B. Rilliet
5. Paris, France Novembre 2011. Meeting society of neurosurgery of French language. Surgical treatment of pharamaco-resistant epilepsies: Prognosis and complications in pediatric population. Y.El Hassani, B.Jenny, S.Momjian, C.Pollo, K.Schaller
6. Goa, India Octobre 2011. 39th Annual Meeting of The International Society For Pediatric Neurosurgery. Seizure control after epilepsy surgery: experience in young children and adolescents. B.Jenny, Y.El Hassani, S.Momjian, C.Pollo, M.Seeck, K.Schaller
7. Lausanne, Suisse Février 2010. 14th Annual Day of the Swiss Cerebrovascular Working Group. Clinical outcome of patients suffering intracranial aneurysms recruited prospectively and consecutively in Geneva. P.Bijlenga, V-M Pereira, Y.El Hassani, Y.Gasche, K.Lovblad, K.Schaller
8. Lausanne, Suisse Février 2010. 14th Annual Day of the Swiss Cerebrovascular Working Group. Combined neurovascular sequencing with intraoperative rotational 3D-angiography: P. Bijlenga, VM Pereira, Y.El Hassani, M. Kotowski, B.Schatlo, I.Radovanovic, S.Momjian, O.Brina , D.Rufenacht, K.Lovblad, K.Schaller
9. Alger, Algérie Mai 2009. Congress Neurosurgery society french language. Postoperative neuropsychological prognosis of extratemporal epilepsies: About 32 patients Y.El Hassani, A. Pegna, C.Pollo, S.Momjian, M.Seeck, K. Schaller.