Maria Fleseriu M.D., F.A.C.E.

Photo of Maria Fleseriu, M.D., F.A.C.E.
Faculty profile
  • Professor and director OHSU NW Pituitary Center

Professor of Neurological Surgery School of Medicine

Accepting new patients

4.7 out of 5 (228 Ratings, 44 Comments)


  • Endocrinology and diabetes

Special focus on

  • Endocrinology


  • M.D., The University of Medicine and Pharmacy of Timisoara, Timisoara Romania 1993
  • Residency:

    • Internal medicine, University Hospital Sibiu, Romania
    • Case Western Reserve University, Internal Medicine
  • Fellowship:

    • Endocrinology, University Hospital Sibiu and National Institute of Endocrinology, Romania
    • Cleveland Clinic, Endocrinology, Diabetes and Metabolism
  • Certifications:

    • Board Certified in endocrinology


Dr. Fleseriu received her medical degree from The University of Medicine and Pharmacy of Timisoara, Romania and completed residency training in internal medicine and an endocrinology fellowship with a focus in pituitary disorders in Romania. Subsequently, she completed an additional internal medicine residency at Case Western Reserve University, Cleveland, Ohio and an endocrinology fellowship at Cleveland Clinic Foundation, Cleveland, Ohio.

Dr. Fleseriu has a long standing clinical and research interest in the pathophysiology and treatment of important clinical aspects of pituitary and adrenal disease. Her recent research is devoted to new treatments of pituitary tumors. She is active in international collaborative studies that include treatment with short and long acting novel multiligands somatostatin analogs, new chimeric molecules directed towards somatostatin and dopamine receptors as well as a new glucocorticoid receptor blocker.

She is a frequent guest speaker on various topics related to treatments of pituitary tumors, especially acromegaly and Cushing’s disease.

As the Director of the NW Pituitary Center at OHSU, Dr. Fleseriu champions a balanced approach to clinical management, combining the most recent advances in the field of neuroendocrinology and the aggressive pursuit of multidisciplinary research. She remains highly involved in teaching medical students, residents, and fellows as well as physician assistant students.

Dr. Fleseriu has published extensively and has coauthored several book chapters detailing pituitary and thyroid pathology.

She is a specialty chief editor for Frontiers in Endocrinology: Pituitary Endocrinology

Clinical interests:

She focuses her clinical practice on the diagnosis and treatment of pituitary and adrenal tumors and pituitary dysfunction, with a particular interest in growth hormone excess (acromegaly) and on cortisol excess (Cushing) and deficiency (adrenal insufficiency).

  • Acromegaly
  • Cushing’s Disease
  • Complex prolactinomas
  • Neuroendocrine disorders
  • Non-functioning pituitary tumors
  • Adrenal disorders

Clinical trials

Dr. Fleseriu is a Professor of medicine/endocrinology and neurological surgery and has served as director of the NW Pituitary Center at Oregon Health & Science University, Portland, OR since 2007. She is a member of  the Editorial Boards for Pituitary and Faculty of 1000-Neuroendocrinology and is an ad hoc reviewer for numerous other journals. She is a member of the Endocrine Society Clinical Guidelines Committee and the American Association of Clinical Endocrinologists Continuing Medical Education Committee.

Visit the Department of Neurological Surgery's website for information about academics, conferences, residency and fellowships.

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  • English

Patient Ratings

4.7 out of 5 (228 Ratings, 44 Comments)

The patient ratings score is an average of all responses to physician related questions on our nationally-recognized Press Ganey Patient Satisfaction Survey

  • Friendliness/courtesy 4.8
  • Explanations about your problem/condition 4.6
  • Concern shown for your questions/worries 4.7
  • Effort made to include you in treatment decisions 4.7
  • Used words you could understand 4.7
  • Amount of time spent with you 4.6
  • Your confidence in care provider 4.8
  • Likelihood of recommending to others 4.7
  • Likelihood of recommending to others 4.5

Patient Comments

  • Jun 21, 2018

    Each interaction I have had with Dr. Fleseriu has consistently proven her strong desire to be thorough in diagnosing and prescribing a treatment care plan, educational about the condition and various treatments, and instructive about what to expect from the treatment care plan or condition.

  • Jun 17, 2018

    The information about my disease and possible cures was excellent. I just wish it could have been done sooner, in a more timely fashion, like tests not taken a month apart, etc..

  • May 25, 2018

    Not only did Dr. Fleseriu answer my questions, she also answered the questions my mother (who accompanied me to my appointment and has the same condition as me) posed.

  • May 12, 2018

    The doctor went on an extensive rant about naturopaths and naturopathic supplements. Basically, she said that she didn't believe in naturopathic medicine and that all supplements were useless and/or dangerous. I agree that many of the supplements available at places like Walmart are of poor quality. However, naturopathic supplements that are verified by a third party have the same, or better, quality as pharmaceutical products. Her attitude and behavior was unprofessional. Also, the record of the appointment indicated that she wanted me to change the way I take warfarin. She didn't say anything about this during the appointment, and she certainly is not in a position to dictate a change in a critical, well managed medication. I don't have the expertise to judge her competency in her specialty, but she didn't inspire a lot of confidence.

  • May 04, 2018

    She is good at explaining things about my health, but at times she talks too fast for things to soak inn for me.

  • Apr 30, 2018

    great provider , timliness is poor, didnt feel like she was thourough on our plan but it was my first appointment. wait till next time to see

  • Mar 27, 2018

    The doctor was very good at explaining what needs to happen next, but the next part hasn't been scheduled yet because I haven't received the call I have been expecting for the last week.

  • Feb 27, 2018

    Nurse Sam and Dr Fless Dog are my healthcare Heros. Nurse Sam courageously battles the evil insurance companies to make sure I have the healthcare I need to live. I am thank full for them. All I am trying to do is get the pesky tumors out of my brain so I can live and let my daughter see me get old and play with her. Dr Fless Dog and Nurse Sam help make sure that happens. I appreciate them so much. I don't like the insurance company who is actively trying to kill me and prevent my curing. Nurse Sam battles them with fists of fury! When they come at her she is like "Come at me bro" And punches them in the throat. When they don't subside or get all pissy, Dr Fless Dog steps in, shoulder checks the fools and they bow down to her neurological authoritay. She makes them pee sitting down. Respectfully, [Name]

  • Feb 20, 2018

    I feel Dr. Fleseriu has given me outstanding care. She is an expert in the disorders I am seeing her for and she is very caring about my health. She is arranging for me to see doctors for other issues caused by my disorders. I have referred others to her for the same disorders I have because she is so knowledgable and caring. Easy to communicate with her office via MyChart.

  • Feb 06, 2018

    No complaints

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