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Program Director

Mitchell S. Cairo, MD 

Clinical Director

Jessica Hochberg, MD 

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HCM Brochure


Histiocytic Disorders

Histiocytic Disorders

The Histiocytosis Program consists of a multidisciplinary team focused on the diagnosis and treatment of histiocytic disorders in children and adolescents. Our physicians participate in national and international committees on diagnosis and management of these rare disorders. This program also focuses on the education of students, residents, and fellows who will participate in clinical and laboratory research of the new and innovative protocols for the treatment of histiocytosis.

Histiocytic disorders occur when there is an overproduction of histiocytes or mononuclear phagocytic cells of bone marrow origin. Overproduction of these cells can lead to organ damage and cause disease, based on the type of the cells involved. Correct and complete pathologic diagnosis is essential because different diseases require different treatment approaches. We focus on the following:

  • Dendritic cell disorders, including Langerhans Cell Histiocytosis (LCH), Juvenile Xanthogranuloma (JXG) and Erdheim Chester Disease (ECD)
  • Macrophage cell disorders, including Hemophagocytic Lymphohistiocytosis (HLH) and Rosai-Dorfman Disease (RD)
  • Malignant histiocytosis, including certain kinds of leukemia and malignant tumors

Unique Features

  • Innovative therapy treatment protocols
  • Outpatient Infusion Center for patients treated for histiocytosis
  • Multidisciplinary services of the pediatric surgery, pathology and radiation medicine for children and adolescents with histiocytic disorders
  • Team of stem cell transplantation specialists

Research and Education Highlights

  • Member Institution of Histiocytosis Society
  • Student, resident and other allied health professional elective education
  • Clinical research on new innovative therapies
  • Education of the parents of children and adolescents afflicted with histiocytic disorders

Contact Us

Pediatric Hematology, Oncology and Stem Cell Transplant
Maria Fareri Children’s Hospital
100 Woods Road
Valhalla, NY 10595

Oya Tugal, MD

Allyson Flower, MD

Edo Schaefer, MD

Nurse Coordinator

Emily Thatcher, PA-C

By Car


Maria Fareri Children’s Hospital is served by Metro North's Harlem line via two stations:

  • White Plains - Bus transfer options available
  • Hawthorne - Taxi service available For train fare and schedule information, call 1-800-METRO-INFO or go to METRO NORTH


There are three bus lines (Westchester Bee Line) you can take to our campus. Please call 914.813.7777 for bus routes and fares.

Campus Map

The Westchester Medical Center campus includes the Maria Fareri Children's Hospital and the Behavioral Health Center.

Flower, Allyson M., MD
Allyson Flower, MD

Assistant Professor of Pediatrics and Microbiology, Immunology,
Clinical Director, Pediatric Stem Cell and Cell Transplant Program
  • Pediatrics, Pediatric Hematology-Oncology
Schaefer, Edo, MD
Edo Schaefer, MD
Assistant Professor, New York Medical College
  • Pediatrics, Pediatric Hematology-Oncology
Tugal, Oya, MD
Oya Tugal, MD
Professor of Pediatrics
  • Pediatrics, Pediatric Hematology-Oncology


Nurse Coordinator

Emily Thatcher, PA-C

Social Work

Barbara McLain, LCSW