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Dr. Andreas Filis got his medical diploma from Athens Medical School in 2004 and moved to Germany for his specialty at the Department of Neurosurgery at Georg-August University of Gottingen.
During his medical career, he worked on countless cases of neurology and neuro-oncology in Greece, Germany and United States. He has also done extensive research on numerous neurological cases and presentations and also, contributed on many scientific publications.
He speaks Greek, English and German fluently and since May 2023, he joined our team of medical specialists and therapists at AIMIS Clinics, and has ever since been a valuable asset.
5/2023- uptodate Neurosurgeon at AIMIS Clinics
12/2019-uptodate GESY Provider-Neurosurgeon
08/2019-2021 Attending Neurosurgeon, Henry Dunant medical center, Athens
07/2018-07/2019 Attending Neurosurgeon, department of Neurosurgery Central Clinic
of Athens, Athens, Greece
05/2016-06/2018 Attending neurosurgeon, department of Neurosurgery, imland Klinik
7/2015-03/2016 Clinical Fellowship Skull base surgery
Louisiana State University-Shreveport
Chairman: Dr. A. Nanda
10/2013 - 06/2015 2 years Neuro-Oncology and Complex Spine (tumor based
reconstruction) clinical Fellowship at University of
South Florida/Moffitt Cancer Center
Program Director: Dr. N. Tran
Chief of Neurosurgery: Dr. F. Vrionis
- Main focus: surgical neuro-oncology (Brain and Spine)
- Strong emphasis on spinal instrumentation and degenerative disorders and reconstructive spine surgery
- Minimally invasive spinal procedures
- Pain management (RFA for tumors, ESI, spinal cord stimulator placement, kyphoplasty procedures)
02/2006 - 03/2013 Resident Physician
University of Erlangen-Nürnberg, Germany
Department of Neurosurgery
Chairman: Prof. Dr. M. Buchfelder
8/2008 - 06/2009 Research Fellowship
Minimally Invasive Neurosurgery Lab
Rainbow Babies and Children`s Hospital
Case Western Reserve University, Ohio, USA
Director: Prof. Dr. A. R. Cohen
12/2004 - 1//2006 Resident Physician
Georg-August University of Göttingen, Germany
Department of Neurosurgery,
Chairman: Professor Dr. M. Buchfelder
6/2003 - 7/2004 Pre-Doctoral Research Position: Athens Medical School:
Department of Physiology, Cell Culture Laboratory,
Subject: Culture of astrocytes, HPLC
1/1999 - 7/2003 Pre-Doctoral Research Position: Athens Medical School:
Department of Psychiatry, Laboratory of psychophysiology,
Subject: Studied evoked related potentials in patients with
traumatic brain injury, Parkinson’s disease, depression etc.
February 4-7, 2015 - 13th Annual Masters Course in Skull Base Surgery, Tampa FL
November 14-15, 2014 - Approaches for Brain Tumor and Vascular Neurosurgery, Hands-On Course, Tampa FL
July 19, 2014 - Radiofrequency-Targeted Vertebral Augmentation with the StabiliT System, Tampa, FL
March 1, 2014 - Complications in Complex Spine Surgery, Avoidance and Management, Medtronic, Tampa FL
February 21-22, 2014 - Minimally Invasive Spinal Surgery and Navigation, Tampa FL
January 2014 - Kyphon Balloon Kyphoplasty, Tampa FL
January 27, 2012 - Microscopic and endoscopic approaches to the skull base, Hands-On Course, IRCAD, Strasbourg,
May 27-29, 2010 - 2nd Baltic Sea 2010-International Hands-On Course on Full HD Endoscopic Neurosurgery, Greifswald,
February 4-5, 2010 - Neurosurgical Management of Pituitary Tumors, Tuebingen,
January 10, 2010 - Operative Techniques on degenerative lumbar spine, Hands-On Course, Munich,
2/2005 - 8/2007 Georg-August University of Göttingen, Germany. Department of
Neurosurgery, Doctoral Thesis: Trigeminocardiac reflex in
1998-2004 University of Athens Medical School, Greece, Medical Diploma
2004 – 2006 Neuroendocrine Dysfunction Following a Traumatic Brain Injury
- In 82 patients admitted for TBI the cortico-, thyreo-, gonado-somatotropic as well as the posterior pituitary function were tested in days 0,3, and 7 after trauma. In some patients, there was also a dynamic pituitary test available. Our study showed that after TBI the hypopituitarism prevalence can be as high as 80%, and the persistent endocrine insufficiency is much less.
2004 – 2009 The Trigeminocardiac Reflex in Pituitary Surgery
- In 40 patients who underwent transsphenoidal pituitary surgery the occurrence of the trigeminocardiac reflex was monitored intraoperatively. In 3 patients we had evidence of the reflex intraoperatively. Biomarkers and demographic data were used to identify predisposing factors for the occurrence of the reflex. In this study cerebral ischemia and possible correlation with the reflex (ischemic preconditioning) is discussed.
September 2008 - Filis A: The orbitozygomatic approach: one and two-piece. Case Western Reserve University, Dept. of Neurosurgery,
October 2008 - Filis A: The subtemporal approach.. Case Western Reserve University, Dept. of Neurosurgery
November 2008 - Filis A: Suboccipital approaches, surgery of the 4th Ventricle (transvermian and telovelar approach). Case Western Reserve University, Dept. of Neurosurgery
December 2008 - Filis A: Surgery for petroclival tumors, the petrosal approach. Case Western Reserve University, Dept. of Neurosurgery
January 2009 - Filis A: The pterional approach, Surgery of Aneurysmas, transcavernous route. Case Wetern Reserve University, Dept. of Neurosurgery
March 2009 - Filis A: The transcallosal and transcortical approach, surgery of the 3rd Ventricle (subchoroidal, transchoroidal,interforniceal) . Case Western Reserve University, Dept. of Neurosurgery, 2008
May 2009 - Filis A, Kahn F : Neurotrauma Lecture. Anatomy course, Case Western Reserve University, Dept. of Neurosurgery
May 2009 - Filis A, Khan F: Skull base surgery:pituitary tumor and acoustic schwanommas. Anatomy course. Case Western Reserve University, Dept. of Neurosurgery
May 2009 - Filis A, Khan F: Microsurgical Approach to the posterior fossa. Anatomy Course. Case Western Reserve University, Dept. of Neurosurgery
May 2009 - Filis A, Khan F: Anatomy of the posterior fossa. Anatomy course. Case Western Reserve University, Dept. of Neurosurgery
May 2009 - Filis A, Khan F: Vertebroplasty. Anatomy course. Case Western Reserve University, Dept. of Neurosurgery
May 2005 - Kleindienst, A. Filis, C. Bock, P. Valbuena, M. Buchfelder: Neuroendocrine Dysfunction following a traumatic brain injury: a prospective longitudinal study. 57th Meeting of the German Society of Neurosurgery,
August 2003 - Papageorgiou C, Boviatsis E, Koujalis A, Kontopantelis E, Filis A (here misspelled as Phillis), Uzunoglou N, Sakkas D, Rabavilas A, Christodoulou G. Assessment of P200 after moderate to severe brain injury. Journal of Psychosomatic Research. Volume 55, Number 2, August 2003, pp143-144
PEER REVIEWED BOOK CHAPTERS:
Schaller B, Filis A, Buchfelder M. (2008). Trigemino-Cardiac Reflex and Imaging The Promise of New Insights. In Schaller Bernhard (Ed.), Neuroscience imaging research trends (pp. 109-110). New York, NY. Nova Science Publishers.
Schaller B, Filis A, Buchfelder M. (2008). Expert Commentary: The Ying and yang of cardiac autonomic control in neurosurgery. In Océane M. Roux (Ed.), Brain Hypoxia-Ischemia Research (pp. 1-6). New York, NY. Nova Science Publisher.
A. Filis and F. Vrionis. Posterior cervical foraminotomy (accepted). In 2nd edition of Handbook of Spine Surgery. Editors: Dr. Ali A. Baaj, Dr. Praveen V. Mummaneni, Dr. Juan S. Uribe, Dr. Alexander R. Vaccaro, and Dr. Mark S. Greenberg.
P. Alikhani, A. Filis and F. Vrionis. Spine Emergencies (submitted). In 2nd edition of Handbook of Spine Surgery. Editors: Dr. Ali A. Baaj, Dr. Praveen V. Mummaneni, Dr. Juan S. Uribe, Dr. Alexander R. Vaccaro, and Dr. Mark S. Greenberg.
Vourla E, Filis A, Cornelius JF, Bostelmann R, Turowski B, Kalakoti P, Rubbert C, Suresh MP, Tortora A, Steiger HJ, Petridis AK. Natural History of De Novo Aneurysm Formation in Patients with Treated Aneurysmatic Subarachnoid Hemorrhage: A Ten-Year Follow-Up. World Neurosurg. 2018 Oct 12
Petridis AK, Filis A, Chasoglou E, Fischer I, Dibué-Adjei M, Bostelmann R, Steiger HJ, Turowski B, May R. Aneurysm wall enhancement in black blood MRI correlates with aneurysm size. Black blood MRI could serve as an objective criterion of aneurysm stability in near future. Clin Pract. 2018 Jul 27;8(3):1089
Fung C, Mavrakis E, Filis A, Fischer I, Suresh M, Tortora A, Cornelius JF, Bostelmann R, Gralla J, Beck J, Raabe A, Khan MO, Steiger HJ, Petridis AK. Anatomical evaluation of intracranial aneurysm rupture risk in patients with multiple aneurysms. Neurosurg Rev. 2018 Jun 30
Volkov AA, Filis AK, Vrionis FD. Surgical Treatment for Leptomeningeal Disease.
Cancer Control. 2017 Jan;24(1):47-53.
Filis AK, Aghayev K, Vrionis FD. Cerebrospinal Fluid and Hydrocephalus: Physiology, Diagnosis, and Treatment. Cancer Control. 2017 Jan;24(1):6-8.
Filis A, Kalakoti P, Connor DE, Nanda A. Elucidating the utility of neuro-navigation in reducing malposition rates in Ommaya reservoir placement: 23-year operative experience at the Louisiana State University. Neurol India. 2016 Nov-Dec;64(6):1195-1201
Filis AK, Robinson LA, Vrionis FD. Resection of the First Rib With Preservation of the T1 Nerve Root in Pancoast Tumors of the Lung. Cancer Control. 2016 Jul;23(3):295-301.
Filis AK, Aghayev K, Schaller B, Luksza J, Vrionis FD. Transdiscal mid- and upper thoracic vertebroplasty: first description of 2 exemplary cases. J Neurosurg Spine. 2016 Aug;25(2):193-7
Nanda A, Filis A, Kalakoti P. Mythological and Prehistorical Origins of Neurosurgery.
World Neurosurg. 2016 May;89:568-73. doi: 10.1016/j.wneu.2016.02.068. Review.
Filis A, Kalakoti P, Nanda A. Symptomatic ecchordosis physaliphora mimicking as an intracranial arachnoid cyst. J Clin Neurosci. 2016 Jun;28:171-4.
Chowdhury T, Nöthen C, Filis A, Sandu N, Buchfelder M, Schaller B. Functional Outcome Changes in Surgery for Pituitary Adenomas After Intraoperative Occurrence of the Trigeminocardiac Reflex: First Description in a Retrospective Observational Study.
Medicine (Baltimore). 2015 Sep;94(37):e1463
Doulgeris JJ, Gonzalez-Blohm SA, Filis AK, Shea TM, Aghayev K, Vrionis FD.
Cancer Control. 2015 Jul;22(3):352-9. Review.
Papanastassiou ID, Filis A, Gerochristou MA, Vrionis FD. Controversial issues in kyphoplasty and vertebroplasty in osteoporotic vertebral fractures. Biomed Res Int. 2014;2014:934206. doi: 10.1155/2014/934206. Epub 2014 Mar 4.
Papanastassiou ID, Filis AK, Gerochristou MA, Vrionis FD. Controversial issues in kyphoplasty and vertebroplasty in malignant vertebral fractures. Cancer Control. 2014 Apr;21(2):151-7.
Filis AK, Aghayev KV, Doulgeris JJ, Gonzalez-Blohm SA, Vrionis FD. Spinal neoplastic instability: biomechanics and current management options. Cancer Control. 2014 Apr;21(2):144-50.
Papanastassiou ID, Filis A, Aghayev K, Kokkalis ZT, Gerochristou MA, Vrionis FD. Adverse prognostic factors and optimal intervention time for kyphoplasty/vertebroplasty in osteoporotic fractures. Biomed Res Int. 2014;2014:925683. doi: 10.1155/2014/925683. Epub 2014 Jan 19.
Abdulazim A, Filis A, Sadr-Eshkevari P, Schulte F, Sandu N, Schaller B. Postcraniotomy function of the temporal muscle in skull base surgery: technical note based on a preliminary study. ScientificWorldJournal. 2012;2012:427081
Schaller BJ, Filis A, Merten HA, Buchfelder M. Premature craniosynostosis - The role of skull base surgery in its correction. A surgical and radiologal experience of 172 operated infants/children. J Craniomaxillofac Surg. 2011 May 19
Schulte F, Filis A, Karageorgos N, Sandu N, Schaller B. Pain after craniotomy - really a problem? Arch Med Sci. 2010 Dec;6(6):827-8.
Sandu N, Cornelius J, Filis A, Nöthen C, Rasper J, Kulinsky VI, Schaller BJ; Trigemino-Cardiac-Reflex-Examination-Group (T.C.R.E.G.). Cerebral hemodynamic changes during the trigeminocardiac reflex: description of a new animal model protocol.
ScientificWorldJournal. 2010 Jul 20;10:1416-23
Moon K, Filis AK, Cohen AR. The birth and evolution of neuroscience through cadaveric dissection. Neurosurgery. 2010 Sep;67(3):799-809; discussion 809-10
Sandu N, Spiriev T, Lemaitre F, Filis A, Schaller B; Trigemino-Cardiac-Reflex-Examination-Group (T.C.R.E.G.). New molecular knowledge towards the trigemino-cardiac reflex as a cerebral oxygen-conserving reflex. ScientificWorldJournal. 2010 May 4;10:811-7
Nöthen C, Sandu N, Prabhakar H, Filis A, Arasho BD, Buchfelder M, Schaller BJ. Trigemino-cardiac reflex and antecedent transient ischemic attacks. Expert Rev Cardiovasc Ther. 2010 Apr;8(4):509-12
Filis AK, Moon K, Cohen AR. Synchronous ventriculoscopic and microsurgical resection of complex craniopharyngiomas. Pediatr Neurosurg. 2009;45(6):434-6. Epub 2010 Jan 26. Review.
Filis AK, Moon K, Cohen AR. Symptomatic Subdural Hygroma and Hydrocephalus following Chiari I Decompression. Pediatr Neurosurg. 2009;45(6):425-8. Epub 2009 Dec 24.
Moon K, Filis AK, Cohen AR. Mobile spinal ependymoma. J Neurosurg Pediatr. 2010 Jan;5(1):85-8.
Sandu N, Cornelius J, Filis A, Arasho B, Perez-Pinzon M, Schaller B. Ischemic tolerance in stroke treatment. Expert Rev Cardiovasc Ther. 2009 Oct;7(10):1255-61
Schaller B, Sandu N, Cornelius JF, Filis A. Comment on "Asystole due to trigemino-cardiac reflex: A rare complication of trans-sphenoidal surgery for pituitary adenoma". J Clin Neurosci. 2009 Dec;16(12):1709
Schaller B, Cornelius JF, Prabhakar H, Koerbel A, Gnanalingham K, Sandu N, Ottaviani G, Filis A, Buchfelder M; Trigemino-Cardiac Reflex Examination Group (TCREG). The trigemino-cardiac reflex: an update of the current knowledge. J Neurosurg Anesthesiol. 2009 Jul;21(3):187-95. Review.
Schaller B, Filis A, Sandu N, Buchfelder M; Trigemino-Cardiac-Reflex Examination Group (T.C.R.E.G.). Peripheral trigemino-cardiac reflex. Acta Neurochir (Wien). 2009 Dec;151(12):1727. Epub 2009 May 26
Schaller BJ, Sandu N, Cornelius JF, Filis A, Perez-Pinzon MA; Trigemino-Cardiac-Reflex-Examination-Group (T.C.R.E.G.). Oxygen-conserving implications of the trigemino-cardiac reflex in the brain: the molecular basis of neuroprotection? Mol Med. 2009 May-Jun;15(5-6):125-6
Schaller B, Sandu N, Filis A, Ottaviani G, Rasper J, Nöethen C, Buchfelder M; Trigemino-Cardiac-Reflex-Examination-Group (T.C.R.E.G.). Trigemino-cardiac reflex: the trigeminal depressor responses during skull base surgery. Clin Neurol Neurosurg. 2009 Feb;111(2):220. Epub 2008 Nov 8
Schaller B, Sandu N, Filis A, Buchfelder M. Peribulbar block or topical application of local anaesthesia combined for paediatric strabismus surgery. Anaesthesia. 2008 Oct;63(10):1142-3; author reply 1143-4
Schaller B, Sandu N, Filis A, Buchfelder M; Trigemino-Cardiac-Reflex-Examination-Group. Cardiovascular responses during percutaneous radiofrequency thermocoagulation therapy in primary trigeminal neuralgia: an explanation of the trigeminocardiac reflex?
J Neurosurg Anesthesiol. 2008 Oct;20(4):270
Schaller B, Filis A, Sandu N, Rasper J, Noethen C, Buchfelder M; Trigemino-Cardiac-Reflex-Examination-Group. Trigemino-cardiac reflex may be refractory to conventional management in adults. Acta Neurochir (Wien). 2008 Sep;150(9):929-30; author reply 931
Schaller B, Sandu N, Ottoviani G, Filis A, Noethen C, Buchfelder M; Trigemino-Cardiac-Reflex-Examination-Group. Transient asystole during endoscopic transsphenoidal surgery: an example of trigeminocardiac reflex. Pituitary. 2009;12(3):271-2.
Schaller BJ, Filis A, Buchfelder M. Trigemino-cardiac reflex in humans initiated by peripheral stimulation during neurosurgical skull-base operations. Its first description. Acta Neurochir (Wien). 2008 Jul;150(7):715-7; discussion 717-8.
Schaller B, Filis A, Buchfelder M; Trigemino-Cardiac-Reflex-Examination-Group. Trigeminocardiac reflex in embolization of intracranial dural arteriovenous fistula.AJNR Am J Neuroradiol. 2008 Aug;29(7):E55.
Schaller BJ, Rasper J, Filis A, Buchfelder M. Difference in functional outcome of ipsilateral tinnitus after intraoperative occurrence of the trigemino-cardiac reflex in surgery for vestibular schwannomas. Acta Neurochir (Wien). 2008 Feb;150(2):157-60. Epub 2007 Dec
Filis A, Schaller B, Buchfelder M. [Trigeminocardiac reflex in pituitary surgery. A prospective pilot study] Nervenarzt. 2008 Jun;79(6):669-75.
Schaller BJ, Weigel D, Filis A, Buchfelder M. Trigemino-cardiac reflex during transsphenoidal surgery for pituitary adenomas: methodological description of a prospective skull base study protocol. Brain Res. 2007 May 29;1149:69-75. Epub 2007 Jan 12.
Schaller BJ, Filis A, Buchfelder M. Detection and prevention of the trigeminocardiac reflex during skull base surgery. Acta Neurochir (Wien). 2007 Mar;149(3):331.