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Anatomic Pathology Services
PATHOLOGY DEPARTMENT Ambulatory Care Center
25751 McBean Parkway
Valencia, CA 91355
Phone: 661/253-8504
Fax: 661/253-8647
Determining the Cause of Disease
Pathology is the branch of medical science that studies the causes, nature and effects of disease. At Henry Mayo, we do that through careful inspection and analysis of tissue and fluid specimens. In the last inspection by the College of American Pathologists, this service was accredited with distinction, an honor reserved for the top 1% of pathology services across the nation.

Excellence to Ensure Accuracy
Pathology at Henry Mayo is far superior to what you will find at a typical community hospital. All physicians in the department are board-certified, and have established links to academic medicine, a hands-on approach to patient care, and outreach to the community in the form of lectures, not-for-profit service and teaching.

Surgical Pathology
Any tissue removed during surgery is sent to this department for evaluation. After a visual (macroscopic) inspection, the pathologist evaluates samples under a microscope. Any abnormalities such as those caused by malignancies, inflammation or autoimmune diseases are reported promptly to a patient's physician.

Cytopathology
Primarily used to find the presence or absence of cancer and other abnormal cells, cytopathology encompasses a variety of procedures that are non-surgical and minimally invasive. The pathologists at Henry Mayo are experts in Fine Needle Aspiration (FNA), used as a diagnostic tool when a "lump" or swelling is felt under the skin or discovered radiologically.

Aspiration Biopsy Service
Henry Mayo is a rarity among community hospitals, operating a dedicated walk-in Aspiration Biopsy Center Service where patients are personally evaluated by a board-certified cytopathologist.

Pathology Staff

Parakrama Chandrasoma, M.D., MRCP (UK)
Lead Partner, Staff Pathologist

Dr. Chandrasoma is world-renowned expert in gastrointestinal pathology and stereotactic brain biopsies. He is also the Chief of Anatomic Pathology at USC Medical Center.

His connection to USC facilitates access to subspecialty expertise and academic consultations on exceptional cases at Henry Mayo.


Barbara Florentine, M.D., RN, ASC
Medical Director of Pathology, Staff Pathologist

Dr. Florentine is a board-certified pathologist with a cytopathology subspecialty certification, a Clinical Assistant Professor of Pathology at USC Medical Center and a registered nurse. She serves on the Henry Mayo's Cancer Committee as the Cancer Liaison Physician (Commission on Cancer of the American College of Surgeons) to the American Cancer Society.


Roger E. Der, M.D.
Associate Medical Director, Staff Pathologist

Dr. Der has played a vital role in upgrading equipment and staffing in the lab, to ensure quality service and accurate results. He has a special interest in the pathology of gastroesophageal reflux disease and has co-authored several scientific papers on the subject of reflux disease and its association with esophageal cancer together with Dr. Chandrasoma. He is also a voluntary member of LAC+USC Medical Center and has a healthcare executive MBA from UC Irvine.


Barry Staymates, BS, CT (ASCP)
Pathology Administrator, Cytotechnologist

Staymates was named "Cytotechnologist of the Year" in 2003 by the California Association of Cytotechnologists. He established cytotechnology departments at other Southern California hospitals before coming to Henry Mayo. He participates on the faculty of the Midwest Institute for Medical Education.
© 2008 Henry Mayo Newhall Memorial Hospital 23845 McBean Parkway Valencia, CA 91355