Stephen Cass, MD, MPH/MSPH
Professor, Otolaryngology

Medical School:
  • MD, Wayne State University School of Medicine (1983)
Graduate School :
  • MPH, University of Michigan (1983)
Undergraduate School:
  • BS, University of Michigan (MI) (1979)
  • St Joseph Mercy Hospital Program (1984)
  • Wayne State University/Detroit Medical Center, Otolaryngology (1988)
  • Providence Hospital/Michigan Ear Institute/Wayne State Program, Neurotology (2000)
Languages: English
Department: Otolaryngology

Recognition & Awards

  • Recognized as Top Neurotologist, 5280 Magazine (2019)
    Also awarded in 2016, 2017, 2018
  • Professor of the Year, University of Colorado, School of Medicine, Department of Otolaryngology (2013)
    Also awarded 2000, 2009


  • Professor (1999)
    School of Medicine, Otolaryngology
    Otology and Neurotology


  • Gonzalez JR, Cass ND, Banakis Hartl RM, Peacock J, Cass SP, Greene NT. Characterizing Insertion Pressure Profiles During Cochlear Implantation: Simultaneous Fluoroscopy and Intracochlear Pressure Measurements. Otol Neurotol. 2020 Jan;41(1):e46-e54. PubMed PMID: 31613835
  • Mattingly JK, Banakis Hartl RM, Jenkins HA, Tollin DJ, Cass SP, Greene NT. A Comparison of Intracochlear Pressures During Ipsilateral and Contralateral Stimulation With a Bone Conduction Implant. Ear Hear. 2019 Aug 2. [Epub ahead of print] PubMed PMID: 31389846
  • Cass ND, Patten L, Cass SP. Collagen Allografts Compared With Autologous Tissue in Tympanoplasty. Otol Neurotol. 2019 Jul;40(6):767-771. PubMed PMID: 31192903
  • Larson ED, Magno JPM, Steritz MJ, Llanes EGDV, Cardwell J, Pedro M, Roberts TB, Einarsdottir E, Rosanes RAQ, Greenlee C, Santos RAP, Yousaf A, Streubel SO, Santos ATR, Ruiz AG, Lagrana-Villagracia SM, Ray D, Yarza TKL, Scholes MA, Anderson CB, Acharya A, Gubbels SP, Bamshad MJ, Cass SP, Lee NR, Shaikh RS, Nickerson DA, Mohlke KL, Prager JD, Cruz TLG, Yoon PJ, Abes GT, Schwartz DA, Chan AL, Wine TM, Cutiongco-de la Paz EM, Friedman N, Kechris K, Kere J, Leal SM, Yang IV, Patel JA, Tantoco MLC, Riazuddin S, Chan KH, Mattila PS, Reyes-Quintos MRT, Ahmed ZM, Jenkins HA, Chonmaitree T, Hafrén L, Chiong CM, Santos-Cortez RLP. A2ML1 and otitis media: novel variants, differential expression, and relevant pathways. Hum Mutat. 2019 Aug;40(8):1156-1171. PubMed PMID: 31009165
  • Maxwell AK, Cass SP. Cochlear Implant Receiver-Stimulator Migration Using the Subperiosteal Pocket Technique: Objective Measurements of Early and Late Positioning. Otol Neurotol. 2019 Mar;40(3):328-334. PubMed PMID: 30742594
  • Chatzimichalis M, Epprecht L, Weder S, Shaul C, Engle Folchert KJ, Machala MC, Goosmann MM, Naville M, Zhu A, Röösli C, Lee DJ, Cass SP, Briggs R, Huber AM, Bächinger D. English translation and validation of the Zurich chronic middle ear inventory (ZCMEI-21-E) assessing quality of life in chronic otitis media: A prospective international multicentre study. Clin Otolaryngol. 2019 May;44(3):254-262. PubMed PMID: 30588758
  • Aref M, Kunigelis K, Cass SP, Youssef AS. Retrosigmoid Approach for Vestibular Schwannoma. J Neurol Surg B Skull Base. 2019 Jun;80(Suppl 3):S271. PubMed PMID: 31143585
  • Schwartz SR, Almosnino G, Noonan KY, Banakis Hartl RM, Zeitler DM, Saunders JE, Cass SP. Comparison of Transmastoid and Middle Fossa Approaches for Superior Canal Dehiscence Repair: A Multi-institutional Study. Otolaryngol Head Neck Surg. 2019 Jul;161(1):130-136. PubMed PMID: 30832543
  • Baschal EE, Larson ED, Bootpetch Roberts TC, Pathak S, Frank G, Handley E, Dinwiddie J, Moloney M, Yoon PJ, Gubbels SP, Scholes MA, Cass SP, Jenkins HA, Frank DN, Yang IV, Schwartz DA, Ramakrishnan VR, Santos-Cortez RLP. Identification of Novel Genes and Biological Pathways That Overlap in Infectious and Nonallergic Diseases of the Upper and Lower Airways Using Network Analyses. Front Genet. 2019;10:1352. PubMed PMID: 32010199
  • Marinelli JP, Cass SP, Mann SE, Haynes DS, Hunter JB, Isaacson B, Sweeney AD, Pelosi S, Willcox TO, O'Connell BP, Rivera M, Lane JI, Carlson ML. Adenomatous Neuroendocrine Tumors of the Middle Ear: A Multi-institutional Investigation of 32 Cases and Development of a Staging System. Otol Neurotol. 2018 Sep;39(8):e712-e721. PubMed PMID: 30001283
  • Santos-Cortez RLP, Chiong CM, Frank DN, Ryan AF, Giese APJ, Bootpetch Roberts T, Daly KA, Steritz MJ, Szeremeta W, Pedro M, Pine H, Yarza TKL, Scholes MA, Llanes EGDV, Yousaf S, Friedman N, Tantoco MLC, Wine TM, Labra PJ, Benoit J, Ruiz AG, de la Cruz RAR, Greenlee C, Yousaf A, Cardwell J, Nonato RMA, Ray D, Ong KMC, So E, Robertson CE, Dinwiddie J, Lagrana-Villagracia SM, Gubbels SP, Shaikh RS, Cass SP, Einarsdottir E, Lee NR, Schwartz DA, Gloria-Cruz TLI, Bamshad MJ, Yang IV, Kere J, Abes GT, Prager JD, Riazuddin S, Chan AL, Yoon PJ, Nickerson DA, Cutiongco-de la Paz EM, Streubel SO, Reyes-Quintos MRT, Jenkins HA, Mattila P, Chan KH, Mohlke KL, Leal SM, Hafrén L, Chonmaitree T, Sale MM, Ahmed ZM. FUT2 Variants Confer Susceptibility to Familial Otitis Media. Am J Hum Genet. 2018 Nov 1;103(5):679-690. PubMed PMID: 30401457
  • Banakis Hartl RM, Cass SP. Effectiveness of Transmastoid Plugging for Semicircular Canal Dehiscence Syndrome. Otolaryngol Head Neck Surg. 2018 Mar;158(3):534-540. PubMed PMID: 29313443
  • Banakis Hartl RM, Greene NT, Jenkins HA, Cass SP, Tollin DJ. Lateral Semicircular Canal Pressures During Cochlear Implant Electrode Insertion: a Possible Mechanism for Postoperative Vestibular Loss. Otol Neurotol. 2018 Jul;39(6):755-764. PubMed PMID: 29889786
  • Farrell NF, Banakis Hartl RM, Benichoux V, Brown AD, Cass SP, Tollin DJ. Intracochlear Measurements of Interaural Time and Level Differences Conveyed by Bilateral Bone Conduction Systems. Otol Neurotol. 2017 Dec;38(10):1476-1483. PubMed PMID: 29084088
  • Alhussaini MA, Mattingly JK, Cass SP. Anatomical Relationship of the Middle Cranial Fossa Dura to Surface Landmarks of the Temporal Bone. Otol Neurotol. 2017 Oct;38(9):1351-1354. PubMed PMID: 28796089
  • Maxwell AK, Banakis Hartl RM, Greene NT, Benichoux V, Mattingly JK, Cass SP, Tollin DJ. Semicircular Canal Pressure Changes During High-intensity Acoustic Stimulation. Otol Neurotol. 2017 Aug;38(7):1043-1051. PubMed PMID: 28570420
  • Chan KH, Gao D, Jensen EL, Allen GC, Cass SP. Complications and parent satisfaction in pediatric osseointegrated bone-conduction hearing implants. Laryngoscope. 2017 Sep;127(9):2165-2170. PubMed PMID: 28092097
View All (17 Total) View Less

Professional Memberships

  • American Academy of Otolaryngology- Head & Neck Surgery, Member
  • American Otologic Society, Member
  • American Neurotologic Society, Member

Practice Locations

Ear, Nose, & Throat - Anschutz
1635 Aurora Ct
Aurora, CO 80045

Hospital Affiliation
  • University of Colorado Hospital
  • Children's Hospital Colorado
  • Denver Health Medical Center
  • Veterans Affairs Medical Center

Specialty Information

  • Otolaryngology, Board Certification (1988)
  • Neurotology, Board Certification (2004, 2010)
  • Bone obliteration Tympanomastoid surgery for cholesteatoma, Specialized Training (2017)
  • Gamma Knife Radiosurgery for vestibular schwannoma and glomus jugulare, Certificate (1999)
  • Cochlear Implants, Specialized Training (0001)
Conditions & Treatments
  • Ear, Nose, and Throat (ENT)
  • Ear, Nose, and Throat (ENT) - Ear Infection
  • Ear, Nose, and Throat (ENT) - Eardrum Perforation
  • Ear, Nose, and Throat (ENT) - Hearing Loss
  • Ear, Nose, and Throat (ENT) - Facial Paralysis
  • Ear, Nose, and Throat (ENT) - Skull Base Tumors
  • Ear, Nose, and Throat (ENT) - Acoustic Neuromas
  • Ear, Nose, and Throat (ENT) - Cochlear Implants
  • Ear, Nose, and Throat (ENT) - Osseointegrated Devices
  • Symptoms and Manifestations - Dizziness and Vertigo
  • Symptoms and Manifestations
  • Ear, Nose, and Throat (ENT) - Tinnitus
Clinical Interests
I provide medical and surgical treatment of adult and pediatric ear disorders including hearing loss, cholesteatoma, otosclerosis, cochlear implants, vertigo/balance disorders, superior semicircular canal dehiscence, acoustic neuroma (Gamma Knife Radiosurgery and open surgery), and cranial base surgery.

Care Philosophy
I strive to provide world class care for ear and hearing disorders in a caring and compassionate manner

Personal Interests
I am passionate educating my patients so they can be informed of all treatment options about teaching the next generation of physicians. I study and research the best treatments for cranial base tumors and hearing restoration using cochlear implants and bone conduction devices

Volunteer Activities
I serve on the advisory board of the Colorado Infant Hearing Consortium and on the board of the Marion Downs Foundation

Public Speaking
I speak regularly locally and also nationally and internationally on cochlear implantation, management of acoustic neuroma and other topics in neurotology

General Information

Medical Schools:
  • MD, Wayne State University School of Medicine (1983)
Graduate Schools:
  • MPH, University of Michigan (1983)
Undergraduate Schools:
  • BS, University of Michigan (MI) (1979)
  • St Joseph Mercy Hospital Program (1984)
Residency Programs:
  • Wayne State University/Detroit Medical Center, Otolaryngology (1988)
  • Providence Hospital/Michigan Ear Institute/Wayne State Program, Neurotology (2000)
Languages: English
Department: Otolaryngology