Neuro Interventional Radiology

Where to
Find us

We are proud to offer state-of-the-art diagnostic imaging services in Pasadena and Glendora, California, and surrounding counties.


Cerebral angiograms of an acute ischemic stroke patient who presented with right upper extremity paralysis and aphasia, before (left) and after (right) mechanical thrombectomy performed by Dr. Konstas. The patient was discharged home without neurologic deficits.

Contact Information – 24 hours Emergency Radiology Services
100 West California Blvd
Pasadena CA 91105
Tel: 626-397-5139

Contact Information – Non-Emergency Clinic/Elective Referral Services
625 South Fair Oaks Ave., Suite 345 Pasadena CA 91105
Frances Pineda, Patient Advocate
Tel: 626-737-2563
Fax: 626-737-2578
Download the order form for NIR services: NIR Order Form

Interventional Neuroradiology

Interventional Neuroradiology is an evolving specialty for minimally-invasive percutaneous and endovascular treatment of brain and spine diseases.  Using advanced cross-sectional and three dimensional imaging, these procedures show great promise for improved diagnosis and clinical outcomes.  The endovascular procedures are performed at Huntington Hospital, in a dedicated biplane neuroangiography lab equipped with rotational angiography and 3D reconstruction software.  In a collaborative relationship with other disciplines, we have full anesthesia support on a daily basis for elective and emergency procedures.  Stroke neurologists are actively engaged in the management of ischemic stroke patients.  We have access to the most modern neurological prosthetic implants (coils, stents, particulate, and liquid embolic materials) and disposable equipment (microcatheters, micro guidewires, and retrievers). 

Commonly Treated Diseases

  • Cerebral aneurysms
  • Brain arteriovenous malformations
  • Dural arteriovenous fistulas
  • Acute ischemic stroke
  • Intra-cranial tumors (e.g. meningioma, hemangioblastoma)
  • Epistaxis
  • Intracranial and extra-cranial atherosclerotic stenosis
  • Traumatic carotid and vertebral artery injury
  • Osteoporotic and neoplastic spinal insufficiency fractures
  • Cutaneous vascular anomalies (e.g. venous malformations, lymphatic malformations, hemangiomas)

Common Neurointerventional Radiology Procedures

  • Cerebral aneurysm coiling
  • Carotid artery angioplasty and stenting
  • Dural and Spinal arterio-venous fistula embolizations
  • Diagnostic catheter cerebral angiograms
  • Embolization of cerebral arteriovenous malformations
  • Pre-operative and palliative tumor embolization
  • Epistaxis treatment
  • Embolization of facial and neck malformations
  • Dural venous sinus stenting for idiopathic intracranial hypertension 
  • Kyphoplasty‎

About our Doctor

Dr. Angelos A. Konstas has completed fellowships in Interventional Neuroradiology and Diagnostic Neuroradiology at the UCLA Medical Center in Los Angeles, California. In 2011, he completed a Diagnostic Radiology Residency at Massachusetts General Hospital of Harvard Medical School in Boston, Massachusetts. Dr. Konstas received his medical degree and a PhD from the University of Oxford, UK. In addition to his medical training, Dr. Konstas was a research scientist in interventional neuroradiology at Columbia University Medical Center, NY. He has published over 30 peer-reviewed studies; his research focus is in acute stroke intervention. Read Complete Biography

Mechanical Thrombectomy in Wake-Up Strokes: A Case Series Using Alberta Stroke Program Early CT Score (ASPECTS) for Patient Selection