Neuro-Oncology Team | Tampa General Hospital

Neuro-Oncology Team

As an academic medical center, Tampa General Hospital offers a collaborative approach to all patient care with experts representing multiple specialties. Our multidisciplinary team includes neuro-oncology specialists, neurosurgeons, radiation oncologists, pathologists, psychologists, physicians assistants, nurses, an integrative medicine team, nutritionists, social workers and more. Additionally, Patients work directly with a care navigator to answer any questions they may have and ensure their experience is as seamless as possible.

Neuro-Oncology Specialists

Dr. Tulika Ranjan headshot   

Tulika Ranjan, MD
Director, Neuro-Oncology
TGH Cancer Institute

Dr. Tulika Ranjan is a renowned neuro-oncologist with training and experience from the best comprehensive neuro-oncology programs in the world. She has a wealth of experience in treating adult primary brain and spinal cord tumors and has conducted groundbreaking research on new therapies for treating glioblastoma (GBM).

Prior to joining Tampa General Hospital, Dr. Ranjan was the director of the Allegheny Health Network (AHN) adult neuro-oncology program that specialized in advanced modalities such as laser interstitial thermal therapy and cancer stem cell chemo-sensitivity testing. She also served as chairperson for AHN Cancer Institute Neurologic-Oncology disease site leadership team.


Noman Ashraf, MD

Dr. Noman Ashraf is a hematologist-oncologist with Tampa General Hospital who specializes in solid tumor oncology. He has been an associate professor of medicine in the Division of Hematology and Medical Oncology at the USF Health Morsani College of Medicine since 2019.

Dr. Ashraf has been an invited speaker and presenter at several regional, national and international conferences, and has served as principal investigator for clinical trials and is credited with several peer-reviewed publications, book chapters and presentations on his areas of expertise.

Neurosurgery Specialists

Headshot of Harry Van Loveren

Harry van Loveren, MD
Chief of TGH Neuroscience Institute, Neurosurgery
Professor & Chair, Department of Neurosurgery and Brain Repair, USF Health Morsani College of Medicine

Dr. Harry van Loveren focuses on providing patients with comfort and confidence with his combination of medical practice, surgical skills, and bedside manner. Specializing in neurosurgery, Dr. Harry van Loveren obtained his medical degree from the University of Cincinnati College of Medicine and serves as a member of the American Association of Neurological and Congress of Neurological Surgeons.

Dr. van Loveren's clinical and research interests include pain, functional neurosurgery, trauma, vascular neurosurgery, and skull base surgery. Since 1982, Dr. van Loveren has contributed over 115 academic papers in various publications and has lectured at more than 200 conferences across the United States and around the world.


Siviero Agazzi, MD, MBA, FACS
Chair, Pituitary Clinic

Dr. Siviero Agazzi pursued advanced training in complex cranial surgery by completing a fellowship in Skull Base and Cerebrovascular Surgery. In 2005  Dr. Agazzi joined the faculty of the University of South Florida Department of Neurosurgery. Since then he has dedicated his practice to complex brain surgery and has gained significant experience in the treatment of tumors (acoustic neuromas, meninigiomas, gliomas), vascular diseases (aneurysms and arteriovenous malformations), trigeminal neuralgia and hemifacial spasm. His expertise has been solicited several times by other neurosurgical teams for complex cranial procedures both in adults and children. At the national level, Dr. Agazzi has been recognized as an expert in complex cranial surgery.


Kunal Vakharia, MD
Neurosurgeon, Neuro-oncology

Dr. Kunal Vakharia specializes in complex cranial and endovascular pathologies. Trained in all aspects of brain surgery, Dr. Vakharia has a particular focus in complex cranial and cerebrovascular pathologies, including aneurysms, arteriovenous malformations and fistulas, carotid and cerebro-occlusive disease, acoustic neuromas, pituitary adenomas, meningiomas, and other skull base tumors. He has over 70 peer-reviewed research articles and over 25 book chapters. He is also trained in minimally invasive and endoscopic surgery.


Puya Alikhani, MD, FAANS
Neurosurgeon, Neuro-Oncology

Dr. Alikhani is a fellowship-trained neurosurgeon with special emphasis on minimally invasive spine surgery for treatment of complex spinal disorders including tumor, scoliosis, trauma, fractures,neck and leg pain and degenerative spinal pathologies. He manages patients with spinal cord tumors as well as peripheral nerve disease. Having published several papers on minimally invasive approaches to spine surgery, Dr. Alikhani has a strong passion for teaching and is constantly involved with multiple research projects. He also lectures on spinal disorders both domestically and internationally.

Radiation Oncology Specialists

Dr John David Headshot

John David, MD
Director of Brachytherapy Services, Tampa General Hospital

Dr. John David is a board-certified radiation oncologist with Tampa General Hospital. He serves as the Director of Brachytherapy Services and Lead Physician of Radiopharmaceuticals. He has advanced sub-specialized training in brachytherapy and extensive expert training in radiopharmaceuticals. His other interests include stereotactic radiosurgery (SRS), intensity modulated radiation therapy (IMRT) and stereotactic body radiation therapy/stereotactic ablative radiation therapy (SBRT/SABR). Prior to joining Tampa General Hospital, Dr. David was fortunate to visit and work with physicians at the New York Proton Center, gaining experience in one of the most contemporary radiation treatment modalities – proton therapy.

 Doctor Brian Collins Headshot

Brian Collins, MD, FCCP
Radiation Oncologist, TGH Cancer Institute

Dr. Brian T. Collins is a board-certified radiation oncologist with significant clinical experience in treating brain, breast and lung cancers. Regarded as a world-renowned expert in CyberKnife® radiotherapy technology, Dr. Collins specializes in cutting-edge radiation oncology techniques and tools. Dr. Collins has frequently contributed to scientific journals, books and publications in areas of his expertise. He is a Fellow in the American College of Chest Physicians (ACCP) and a member of numerous related professional organizations.