Pituitary Tumor Program of Excellence                      

graphic of brain highlighting pituitary glandpituitary graphic


The University of Colorado Pituitary Tumor Program is one of the largest and most experienced multi-disciplinary pituitary programs in the country. The program, directed by Dr. Kevin O. Lillehei, Chair of the Department of Neurosurgery, has experience in the treatment of well over 2,000 surgical cases. In conjunction with Dr. Margaret Wierman, Director of the Pituitary Center, they have assembled a nationally recognized team to comprehensively evaluate your tumor and symptoms. The team includes specialists from neurosurgery, neuro-ophthalmology, neuro-pathology, neuroradiology, head and neck surgery, and radiation oncology.


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Kevin O. Lillehei, MD    (Neurosurgery) 

dr wierman

Margaret Wierman, MD (Endocrinology)

Multidisciplinary Team Members

The pituitary team is filled with many specialists from various fields.  Please click on the links below to learn more about our providers:

Pituitary Program video


Kevin Lillehei, MD

Samy  Youssef, MD 

Helen French, PA-C

Timothy Ung, MD

Colin Catel, PA-C 


Margaret Weirma, MD 

Christie Turin More, MD 

Katja Kiseljak-Vassiliades, DO 


Brian Kavanaugh, MD   

Chad Rusthoven, MD  


Prem Subramanian, MD 


Bette Demasters, MD 


Jody Tanabe, MD 

Tom Borges, MD 

Justin Honce, MD. 

More About the Pituitary

The pituitary is a small, bean-shaped gland located below the brain in the skull base, in an area called the pituitary fossa or sella turcica. The gland is regulated by a region of the brain called the hypothalamus and is connected to the pituitary by a thin delicate vascular connection called the pituitary stalk or infundibulum. Weighing less than one gram and measuring a 10 – 12 millimeters in graphic explaining how the pituitary gland works in the bodywidth, the pituitary gland is often called the "master gland" since it controls the secretion of the body's hormones. These substances when released by the pituitary into the blood stream have a dramatic and broad range of effects on growth and development, sexuality and reproductive function, metabolism, the response to stress and overall quality of life. The pituitary gland is thus at the anatomical and functional crossroads of the brain, mind and body.

Disorders of the pituitary can cause a wide spectrum of symptoms, both hormonal and neurological.

Pituitary tumors (also called pituitary adenomas) can result in hormonal overproduction causing serious endocrine disturbances such as acromegaly (excess GH), Cushing's disease (excess ACTH) or prolactinoma (excess prolactin). Other pituitary adenomas are non-functional or "endocrine-inactive," meaning that they do not produce excess hormones. Instead, as these tumors enlarge, they can cause compression of the normal pituitary gland leading to decreased or absent hormone production (hypopituitarism or pituitary failure), visual loss from optic chiasm or optic nerve compression and headaches. Pituitary failure may also result from bleeding into a pituitary tumor, pituitary or intracranial surgery, radiation therapy to the pituitary or head trauma. Other tumors that arise near the pituitary gland which can also impact pituitary hormonal function include Rathke's cleft cysts, craniopharyngiomas, meningiomas, chordomas, gliomas and epidermoid cysts.

Disorders Treated

  • Acromegaly
  • Adrenal Insufficiency (Addison's Disease)
  • Craniopharyngioma
  • Cushing's Syndrome
  • Empty Sella Syndrome
  • Familial Isolated Pituitary Adenoma
  • FSH & LH Tumors
  • GH Deficiency
  • Hyperparathyroidism
  • Hypogonadism
  • Hypopituitarism
  • Hypothyroidism
  • Non-Functioning Tumors (Endocrine-Inactive Tumors)
  • Pituicytoma
  • Prolactinomas
  • Rathkes Cleft Cysts
  • Sheehan's Syndrome
  • TSH (Thyroid Stimulating Hormone) Secreting Tumors


Treatment involves a team of medical experts, possibly including a brain surgeon (neurosurgeon), endocrine system specialist (endocrinologist) and a radiation oncologist. Doctors generally use surgery, radiation therapy and medications, either alone or in combination, to treat a pituitary tumor and return hormone production to normal levels.

Graphic showing placement of pituitary gland in the head

Surgical Treatment

Surgical removal of a pituitary tumor usually is necessary if the tumor is pressing on the optic nerves or if the tumor is overproducing certain hormones. The success of surgery depends on the tumor type, its location, its size and whether the tumor has invaded surrounding tissues. The two main surgical techniques for treating pituitary tumors are:

  • Transnasal microscopic or endoscopic transsphenoidal approach. This usually enables your doctor to remove the tumor through your nose and sinuses without an external incision. No other part of your brain is affected, and there's no visible scar. Large tumors may be difficult to remove this way, especially if a tumor has invaded nearby nerves or brain tissue.
  • Transcranial approach (craniotomy). The tumor is removed through the upper part of your skull via an incision in your scalp. It's easier to reach large or more-complicated tumors using this procedure


To make an appointment 
call 720.848.2080

Neurosurgery (SOM)

CU Anschutz

Academic Office One

12631 East 17th Avenue


Aurora, CO 80045


CU Anschutz

University Hospital - Neurosurgery Patient Affairs

12605 E 16th Ave

Aurora, CO 80045


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