Shocking Facts About Brain Tumors — and Why Who Performs Your Surgery Changes Everything

A brain tumor diagnosis changes everything about the conversation that follows. The medical terminology comes fast. The treatment decisions feel urgent. And somewhere in the overwhelming early days, a question emerges that most patients don’t know is the most important one they’ll ask: who should perform this surgery?

The answer matters more than almost anything else in the treatment plan. And the statistics behind why are worth understanding clearly.

At the ATLAS Institute of Brain and Spine in Los Angeles, Dr. Aaron Cohen-Gadol has established a practice built around one of the most specific and extensively documented arguments in neurosurgery: outcomes in complex brain surgery correlate directly with surgeon experience and volume. His more than 7,500 complex brain surgeries — a figure that represents more complex procedures than any other single surgeon in the United States has performed — isn’t a marketing credential. It’s the foundation of an outcomes argument backed by the neurosurgical literature he has contributed to with over 600 peer-reviewed publications. He is the recipient of the Vilhelm Magnus Medal, one of the most prestigious honors in international neurosurgery, and the founder of the Neurosurgical ATLAS — the most widely used open-access neurosurgical education platform in the world.

Here is what the data says about brain tumors, surgical outcomes, and why the decision of where to have surgery is the one that deserves the most careful attention.

Brain Tumors Are More Common Than Most People Realize

According to the American Brain Tumor Association, approximately 88,000 people in the United States are expected to receive a primary brain tumor diagnosis each year — a number that doesn’t include secondary (metastatic) brain tumors, which arrive when cancer from elsewhere in the body spreads to the brain.

Among primary brain tumors, gliomas — including glioblastoma (GBM) — are among the most aggressive. Meningiomas, which arise from the meninges surrounding the brain, are the most common primary brain tumor type overall. Acoustic neuromas, pituitary tumors, craniopharyngiomas, and skull base lesions each present distinct surgical challenges based on their location, their relationship to critical neural structures, and their proximity to blood vessels that cannot be damaged.

The diversity of tumor types, locations, and patient anatomies is exactly why surgical experience isn’t fungible. The surgeon who has operated on thousands of meningiomas of varying sizes and locations has accumulated a pattern recognition — in both intraoperative decision-making and the management of unexpected findings — that a surgeon with limited tumor case volume simply cannot replicate.

Surgical Volume Predicts Outcomes — and the Data Is Consistent

The relationship between surgical volume and patient outcomes is one of the most robust findings in surgical research. For complex neurosurgical procedures, including brain tumor resection, the evidence consistently shows that higher-volume surgeons and higher-volume centers produce better outcomes: lower rates of perioperative complications, higher rates of achieving the surgical goals (typically maximal safe tumor removal), lower rates of new neurological deficits after surgery, and in some analyses, longer overall survival.

This isn’t a subtle difference at the margins. In high-stakes, highly technical procedures — where the margin between adequate and exceptional execution is measured in millimeters, and where those millimeters determine whether critical language, motor, or visual function is preserved — the cumulative experience of thousands of similar cases is the most meaningful predictor of outcome available.

Dr. Cohen-Gadol’s practice is built around this evidence. His techniques — fluorescence-guided tumor surgery using fluorescein to delineate tumor boundaries, intraoperative MRI and neuronavigation for precision guidance, and high-definition microsurgical visualization — reflect the convergence of surgical innovation and clinical volume that produces outcomes patients can travel across the country, and across the world, to access.

What “Maximal Safe Resection” Actually Means

For most primary brain tumors, the goal of surgery is maximal safe resection: removing as much tumor as possible while preserving the neurological function of the surrounding brain. The tension between “maximal” and “safe” is where surgical expertise is most consequential.

Tumor cells infiltrate the brain tissue surrounding the visible tumor mass. The transition zone between tumor and healthy brain is not always clearly defined, and the surgical decision of where to stop removing tissue and where to preserve it requires both technical precision and the judgment that comes from extensive experience with similar cases.

For tumors near eloquent cortex — the regions responsible for speech, movement, or vision — preserving function while removing maximum tumor is the highest-stakes version of this challenge. The intraoperative mapping technologies that Dr. Cohen-Gadol employs, including awake craniotomy when appropriate, allow real-time assessment of neurological function during surgery, enabling the surgical plan to be adjusted based on what the patient’s brain is actually doing rather than what preoperative imaging predicted.

Second Opinions Change Treatment Plans More Often Than Patients Expect

One of the most consistent findings in complex oncological and surgical care is that specialist second opinions change the recommended treatment plan in a significant proportion of cases. In brain tumor care specifically, the nuances of surgical approach, the feasibility of aggressive resection, the choice of surgical technique, and the sequencing of surgery with adjuvant therapy are decisions where expert variation is real.

For patients who have received a diagnosis and a treatment recommendation from a community hospital or from a general neurosurgeon, seeking evaluation at a high-volume center with subspecialty expertise in their tumor type is not a rejection of prior care — it’s the informed exercise of the same decision-making process that produced every major advance in outcomes for complex neurological conditions.

The ATLAS Institute welcomes patients for second opinion consultations, including review of MRI and prior imaging, and provides telemedicine options for patients who cannot travel to Los Angeles for an initial evaluation. Patients come from across Southern California — Beverly Hills, Santa Monica, Pasadena, Glendale, and beyond — and from around the world for access to surgical expertise that is available in very few places.

ATLASGPT: Where Surgical Innovation Meets Patient Care

Dr. Cohen-Gadol’s development of ATLASGPT — an AI-powered surgical planning and decision-support system — reflects the same philosophy that defines the practice: the pursuit of better outcomes through the application of accumulated knowledge. The platform is designed to support surgical planning with the depth of an integrated knowledge base that reflects Dr. Cohen-Gadol’s decades of surgical experience and publication record.

This is what the ATLAS Institute offers that is genuinely rare: the convergence of volume, innovation, and a provider who has defined much of the subspecialty he practices.

Schedule Your Consultation at ATLAS Institute of Brain & Spine

The ATLAS Institute of Brain and Spine is located in Los Angeles and serves patients throughout Southern California and beyond. Dr. Aaron Cohen-Gadol conducts consultations personally, reviews all imaging before seeing patients, and provides clear, honest guidance about surgical options, risks, and realistic expectations. For out-of-town patients, telemedicine consultation is available as an initial step. Visit atlasneurosurgeryinstitute.com or contact the practice to schedule your consultation. In brain tumor surgery, the most important decision you make is who performs it.

This blog is educational and does not constitute medical advice. All treatment decisions, including surgery, should be made in consultation with qualified medical professionals who have reviewed your specific case and imaging.