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Neurointerventional Radiology Fellowship

The Neurointerventional Radiology Division at UMass Memorial has its roots starting in 2006 when Dr. Wakhloo started the only Neurointerventional Program in central Massachusetts. Dr. Wakhloo is a pioneer in the field of flow diversion, the newest technology in the treatment of cerebral aneurysm. He has authored over 150 publications and contributed to numerous books on interventional radiology over his distinguished 30-year career. He has also served as a research thesis advisor for more than 20 students and mentored numerous fellows in Neurointervention. Since its inception, the Division has grown to include three attending physicians, two fellows, and two mid-level care providers with a goal of being leaders in neurointerventional therapy.

The current Director of the Neurointerventional Fellowship Program, Dr. Ajit S. Puri, has many publications in peer-reviewed journals, is one of the most highly experienced interventionalists in using flow diversion, and has research interests in clot characteristics and morphology and maximizing the design of mechanical thrombectomy devices. He is the principal investigator of numerous national and international trials and registries at UMass Memorial Medical Center, offering advanced and minimally invasive techniques to treat cerebrovascular diseases. UMass Memorial Medical Center is the only center to offer these novel therapies, not only in Massachusetts, but in the New England region. 

Therapeutic Procedures and Case Load:

 Endovascular procedures that are currently offered include:

  • Cerebral (Brain) Angiography
  • Spinal Angiography
  • Brain Aneurysm Treatment (Coil Embolization, Stenting, Flow Diversion)
  • Brain and Spinal Arteriovenous Malformations Treatment
  • Acute Ischemic Stroke Treatment
  • Carotid and Vertebral Artery Stenting
  • Vertebral Augmentation (Kyphoplasty, Vertebroplasty)
  • Epistaxis Embolization
  • Brain and Spinal Tumor Embolization
  • Sclerotherapy of Vascular Abnormalities
  • Treatment of Pediatric Brain and Spinal Vascular Abnormalities
  • Spinal Bone Biopsies
  • Intracranial Stenting

Annually, we treat between 900-1100 patients including up to 600 cerebral angiograms, up to 200 aneurysms, 80-100 stroke interventions and approximately 100 spinal interventions.

Positions Available: 1
Length of Fellowship: 24 months
Application Dates: No longer accepting applications for fellowships beginning July 1, 2022 (Please check back for details regarding future application dates and deadlines.)
Interview Dates: November through March

Neurointerventional Radiology Faculty

Program Goals

The goal of the Neurointerventional Radiology Division of UMass Memorial Health Center is to provide comprehensive, state-of-the-art, minimally invasive care to patients with vascular diseases of the brain and spine including stroke, aneurysm, arteriovenous malformations, vascular stenosis, and spinal abnormalities.


The extensive facilities within the New England Center for Stroke Research provide a variety of opportunities for fellows to participate in basic and translational research in Neurointerventional.

In addition, the Neurointerventional Radiology Division is actively involved in clinical research with recent participation in over 15 trials and registries. The Division also has a full time clinical research coordinator who is involved in all trials and registries. The Division is involved in several multi-center publication efforts in stroke and aneurysm research.


  • Every Tuesday there is an interdisciplinary conference that includes the division of neurology, neurosurgery, and radiology held to review imaging and case findings, as well as establish a clinical plan for patients with challenging cerebrovascular disorders.
  • Radiology and Neurology Grand Rounds are held throughout the year with visiting and local professors offering the opportunity to meet and learn from leading national authorities on a wide variety of topics.
  • Every Wednesday afternoon, the disciplines of Neurointervention, Trauma, Neurosurgery and Neurointensivist’s meet for the NeuroICU conference to discuss management of all NeuroICU patients.
  • Every Friday morning, the division of Neurointerventional Surgery has its clinical meeting to discuss the various trials and registries. In addition, potential projects and publications are discussed as well. Every Friday afternoon, NECStR research meeting is held to discuss progress of ongoing ventures, discuss collaborations with various other local, national and international leaders. Potential new projects are also discussed between the various participants. These platforms offer the seamless transition from basic science to clinical science.
  • The NECStR lab serves as a physician training site for multiple interventional devices and hosts several guest lecturers each year, providing additional opportunities for fellows to learn and advance technical skills. 


Imaging Facilities / Locations

Our facilities include two, state-of-the-art angiography suites with flat-panel detector x‑ray systems. Both suites have bi-plane angiographic capabilities, allowing the interventionalists to work in two angiographic views simultaneously and also include the capability for 3-dimensional reconstruction angiography (3DRA) and X-per™ Cone Beam Computed tomography. One suite houses an angiography program (Clarity) that delivers enhancements in radiographic image quality that ultimately allows a significant reduction in radiation dose (up to 70%) for patients and operators.

The close research partnership with the well-known New England Stroke Center for Research (NECStR), directed by Matthew Gounis, PhD, provides a unique opportunity for collaboration and participation in basic and translational research. The NECStR lab features a state-of-the art angiosurgical suite that is fully equipped for aseptic surgical and interventional procedures and imaging technology that mirrors the clinical angiosurgical suites. In addition, the 3T Philips Achieva MR Scanner that is located next to the suite in the Advanced MR Imaging Center provides additional multi-modal imaging acquisition capabilities. The Center also includes a chemistry and hemodynamic lab and small animal imaging capabilities.

Information and Application

Positions Available: 1
Length of Fellowship: 24 months
Application Dates: No longer accepting applications for fellowships beginning July 1, 2022.

Interview Dates: November through April

Contact Information:
Annika Mitchell
Fellowship Program Coordinator
Tel: 508.856.5740
Fax: 508.856.1860

Applicants must have completed a radiology residency program accredited by the ACGME by the time they begin their fellowship at UMMMC. Applicants must be certified or eligible for certification by the American Board of Radiology (ABR) or equivalent. Acceptance is contingent on obtaining an unrestricted Massachusetts medical license by start date of Fellowship.

Applications must include:

  • Fellowship Application (click here to download PDF)
  • Personal Statement
  • Curriculum vitae
  • Three letters of recommendation, one of which must be from your residency program director
  • USMLE Scores
    • Fellowship applicants need to have passed ALL USMLE scores, Step 1, Step 2CK, Step 2CS and Step 3.
    • Applications that are missing USMLE Step 3 will not be considered.
  • Medical school transcript
  • Deans Letter
  • Optional - Copy of Radiology IR Procedure Log
  • ECFMG Certificate (if applicable)

Candidates will be considered for interviews once all application materials are received. Letters of Recommendation should be addressed to the respective Program Director and emailed to Annika Mitchell directly by your Program Coordinator or letter writer.  All application materials must be submitted electronically via email to:

Neurointerventional Fellowship Program
Attention: Annika Mitchell
Department of Radiology, Room S2-302
University of Massachusetts Medical School
55 Lake Avenue North
Worcester, MA 01655

Due to COVID, applications must be submitted electronically via email to Annika Mitchell (  If email is not a viable option, please contact Annika Mitchell to discuss alternative modes of delivery.

Ajit S. Puri, MD DM Program Director Neuro Interventional Fellowship
Ajit S. Puri, MD DM
Program Director
Neurointerventional Radiology Fellowship