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

Head Shot of Maria Fleseriu
Endocrinology & Diabetes
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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 an Associate 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.

Clinical Position

Associate Professor and Director OHSU NW Pituitary Center


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

    Internal Medicine, University Hospital Sibiu, Romania
    Internal Medicine, Case Western Reserve University, Cleveland, Ohio 2002-2004

  • Fellowships:

    Endocrinology, University Hospital Sibiu and National Institute of Endocrinology, Romania
    Endocrinology, Diabetes and Metabolism, Cleveland Clinic Foundation, Cleveland, Ohio 2004-2006

  • Certifications:

    Board Certified in Endocrinology
    Board Certified in Internal Medicine


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