International recognition for treatment of arteriovenous malformations distinguishes Dr. Hoi Sang U, Emeritus Professor of Neurological Surgery at UC San Diego, whose Google listing sits at 200 W Arbor Dr in 92103. Neurovascular imaging workup for AVMs, cerebral aneurysms, and cavernous hemangiomas runs through UCSD Medical Center Rad, reflecting longstanding collaboration with interventional neuroradiology for diagnostic angiography and pre-operative embolization planning. Dr. U earned his MD from Tufts University School of Medicine in 1972, completed neurosurgery residency at UCSF under Dr. Charles Wilson in 1978, and joined the UCSD neurosurgery faculty the same year. His surgical case mix since joining the UCSD faculty in 1978 covered skull base tumors, transsphenoidal pituitary adenoma resections, meningiomas, astrocytomas, craniopharyngiomas, and patients referred from Australia, Hong Kong, and Brunei for complex AVM surgery. Ruptured aneurysm and subarachnoid hemorrhage cases presenting through the UC San Diego Health Hillcrest Emergency Department move directly to the neurosurgical OR when external ventricular drainage, surgical clipping, or endovascular coiling is required. The highest-complexity work remains staged microsurgical resection of deep-seated AVMs, where intraoperative angiography and neuro-anesthesia must converge to eliminate a vascular nidus without sacrificing eloquent cortex.