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Dr. Teresa O and Dr. Milton Waner


We provide clinical evaluations, review imaging studies, review photographs, and consult with medical experts in order to make the most accurate diagnosis of the lesion and to present the most effective treatment plan.

Our highly skilled clinical staff offers expert assistance to you and your family in the pre- and posttreatment period.

The Vascular Birthmark Institute of New York was founded by experts, Dr. Milton Waner and Dr. Alejandro Berenstein.

Dr. Waner is an internationally recognized expert and a pioneer in the surgical management of hemangiomas and vascular malformations. His colleague, Dr. Berenstein is a renowned endovascular surgeon who heads the Hyman-Newman Institute for Neurology and Neurosurgery. He is a pioneer in the use of endovascular techniques used to treat vascular malformations. Dr. Waner and Dr. Berenstein have combined their talents and extensive experience to develop new techniques for the management of some of the most difficult hemangiomas and vascular malformations.

For over 30 years, Dr. Waner has restricted his practice to the treatment of hemangiomas and vascular malformations. He has accumulated a wealth of experience and we believe that he has performed more surgeries in this field than anyone else. Dr. Waner has developed a unique approach to children and adults with vascular lesions. He was the first to recognize the differences between focal and segmental hemangiomas and the first to advocate for early intervention of these lesions. He has published widely in the field contributing over 100 scientific publications. He has also written and/or edited 3 textbooks in this field.

Dr. Teresa O joined the surgical team in 2007 and has helped to expand the practice. Together, they have developed new surgical techniques for some difficult life-threatening lesions.

Dr. Waner has assembled a multidisciplinary team of experts who collaborate to provide optimal individualized care for our patients.

The Vascular Birthmark Institute provides diagnosis and treatment for children and adults suffering from the following conditions:

  • Vascular Tumors
    • Infantile Hemangiomas (most common, aka strawberry hemangiomas)
    • Pyogenic Granuloma
    • Congenital Hemangiomas (RICH, NICH and PICH)
    • Kaposiform Hemangioendothelioma
    • Other vascular tumors
  • Vascular Malformations
    • Capillary Malformation (Port Wine Stain)
    • Venous Malformation
    • Lymphatic Malformation
    • Arteriovenous Malformation
    • Mixed Malformations
    • Midline capillary stain (aka Stork bite, Angel’s kiss, midline venular malformation)
  • Hereditary Hemorrhagic Telangiectasia (HHT, previously, Osler-Weber-Rendu Syndrome)
  • Other vascular birthmarks
  • Other common congenital birthmarks
    • Nevus (pigmented and nonpigmented)
    • Congenital lipomatosis
    • Neurofibromatosis

The physicians at the Vascular Birthmark Institute of New York believe that effective treatment starts with an accurate diagnosis. Our doctors have earned a reputation as the go-to clinic for difficult cases, especially those that have been misdiagnosed in the past and patients who have not been able to find an effective treatment for their condition.

Recent developments in the field of congenital vascular malformations have shown that a multidisciplinary approach to treatment is necessary to achieve the best results. Our physicians meet frequently to discuss patients’ management and treatment.

All our physicians are considered world experts. Dr. Waner is a world authority in hemangiomas and vascular malformations and has remained at the forefront of his field for decades. If you or a loved one has been suffering from an hemangioma or malformation and you are looking for an experienced physician that can help, we have the skill and experience for the best outcomes.

Our mission is to continue to provide world-class care in the diagnosis, treatment, management, and research of all vascular birthmarks. We are engaged in research and publish state-of-the-art research frequently. For a bibliography of recent and important articles published by some of our physicians please click here.

Every patient is treated like a family member at the Vascular Birthmark Institute of NY.

We treat patients from all over the world and across the U.S.A.

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