Mark Hornyak, MD

Board Certified Neurosurgeon

About Me

I am a Board Certified Neurosurgeon who specializes in General Neurosurgery and treats disorders of the brain and spine.

View my Cirriculum Vitae (CV)


Undergraduate Education

Loyola College, Baltimore, Maryland, 1992-1996

Medical School

University of Maryland, Baltimore, Maryland, 1996-2000

Neurosurgery Residency

New York Medical College, Valhalla & New York, New York, 2001-2006

Skull Base Fellowship

University of Utah, Salt Lake City, Utah, 2006-2007

What is Neurosurgery?

According to the American Board of Neurological Surgery: Neurological surgery constitutes a medical discipline and surgical specialty that provides care for adult and pediatric patients in the treatment of pain or pathological processes that may modify the function or activity of the central nervous system (e.g. brain, hypophysis, and spinal cord), the peripheral nervous system (e.g. cranial, spinal, and peripheral nerves), the autonomic nervous system, the supporting structures of these systems (e.g. meninges, skull & skull base, and vertebral column), and their vascular supply (e.g. intracranial, extracranial, and spinal vasculature).

Treatment encompasses both non-operative management (e.g. prevention, diagnosis – including image interpretation – and treatments such as, but not limited to. neurocritical intensive care and rehabilitation) and operative management with its associated image use and interpretation (e.g. endovascular surgery, functional and restorative surgery, stereotactic radiosurgery, and spinal fusion – including its instrumentation.

Conditions Treated

As a general neurosurgeon, Dr. Hornyak surgically treats the majority of neurological conditions in adults.

Common Brain Conditions

  • Brain Tumors
        Brain Cancer
  • Vascular lesions of the brain
  • Pituitary tumors
  • Schwannoma, including vestibular schwannoma (aka Acoustic Neuroma)
  • Trigeminal neuralgia (aka Tic Douloureux)
  • Chiari Malformation
  • Hydrocephalus

Specializing in:

  • Brain surgery for benign and malignant tumors of the brain
  • Endoscopic transsphenoidal surgery for pituitary tumors
  • Image-guided brain surgery

Common Spine Conditions

  • Spinal Stenosis
  • Disc herniation
  • Degenerative disc disease
  • Spondylolisthesis (a spinal deformity)
  • Cancer of the spine
  • Spinal cord tumors
  • Spinal schwannoma and neurofibroma
  • Spinal meningioma
  • Compression fracture
  • Comples spine fracture and deformity

Specializing in:

  • Minimally invasive spinal surgeries
  • Alternatives to spinal fusion surgery
        Disc replacement surgery (aka Arthropalsty)
  • Image-guided spinal surgery

Procedures Performed

Common Brain Procedures

  • Craniotomy for brain tumor
  • Craniotomy for meningioma
  • Microvascular decompression (MVD)
  • Craniotomy for hematoma
  • Ventriculoperitoneal Shunt
  • Chiari decompression
  • Craniofacial reconstruction & cranioplasty

Specializing in:

  • Image-guided resection of brain tumors
  • Fluorescence-guided resection of brain cancer
  • Endoscopic resection of pituitary adenoma

Common Spine Procedures

  • Decompressive laminectomy
  • Microdiscectomy
  • Arthroplasty (artificial disc, or disc replacement) surgery
  • Resection of spinal tumors
  • Spinal fusion surgery
  • Kyphoplasty
  • Correction of spinal deformity

Specializing in:

  • Image-guided spine surgery
  • Alternatives to spinal fusion
         Interlaminar stabilization
  • Minimally invasive spine surgery
  • Treatment of spine tumors and cancer

Inside the Modern Operating Room

We use the most up to date and technologically advanced equipment in the operating room to make your surgery safer and recovery faster.

Click a link below to learn more about our state-of-the-art surgical tools and techniques

  • All
  • Navigation
  • Intra-op Imaging
  • Microsurgery



Meet our dedicated team

Mark Hornyak



Office Coordinator

Adam Riso

Physician Assistant


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Our Address

One Town Park Plaza, Norwich, CT 06360

100 Perkins Farm Road Suite 300, Mystic, CT 06305

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