California Sinus Centers Bay Area ENT Sinus Doctors * Atherton, Walnut Creek, Sacramento, Pleasanton, Sonoma, Clovis/Fresno

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3351 El Camino Real, Suite 200
Atherton, CA 94027
Phone: (650) 399-4630
Fax: (650) 366-4930

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Contacts & Resources

Phone Numbers

Atherton:(650) 399-4630
Fresno:(650) 399-4630
Pleasanton: (925) 300-4680
Sonoma: (650) 399-4630 
Walnut Creek: (925) 300-4680

Web Site
News California Sinus Centers launch a new ENT website to better serve the sinuses of the Bay Area
All Locations


3351 El Camino Real, Suite 200
Atherton, CA 94027

 (650) 399-4630
 (650) 366-4930


2021 Herndon Ave., Suite 201
Clovis, CA 93611

 (650) 399-4630
 (650) 366-4930


5924 Stoneridge Dr., Suite 207
Pleasanton, CA 94588

 (925) 300-4680
 (925) 906-9780


371 Perkins St
Sonoma, CA 95476

 (650) 399-4630 
 (650) 366-4930


Walnut Creek

2123 Ygnacio Valley Road Bld K, Suite 100
Walnut Creek, CA. 94598

 (925) 300-4680
 (925) 906-9780



Services Offered by the California Sinus Centers


Sinusitis is infection or inflammation of the paranasal sinuses (often just referred to as “sinuses”), which are air-filled spaces that surround the nasal cavity. Common symptoms of sinusitis include nasal congestion, nasal drainage, facial pressure or fullness, and a decreased sense of smell.

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Nasal Polyps & Allergies

Nasal polyps are watery-appearing swellings that arise from the lining of the nasal and sinus cavities. They are found more commonly in patients with allergies, chronic sinusitis, and asthma.

Click here for more information about nasal polyps and allergies

Nasal & Sinus Surgery

Nasal and/or sinus surgery may be indicated for treatment of a variety of common conditions that we see at the California Sinus Centers.

Click here for more information about nasal and sinus surgery

Sinus Tumors & CSF Leaks

Tumors within the nasal or sinus cavities can be benign (not cancer) or malignant (cancer). Their treatment varies greatly based on type of tumor, location and size. Possible treatment options include surgery, chemotherapy and/or radiation. Treatment recommendations are based on the best evidence in the medical literature and frequently involve the care of many specialists.

A tear in the brain lining (called the dura) and the bone separating the sinuses from the brain can result in a drainage of fluid called cerebrospinal fluid or CSF. A CSF leak can occur from many different sources.

Click here for detailed information about sinus tumors and CSF leaks

Conditions We Treat

While our practice is primarily restricted to disorders of the nose and sinuses we do treat some other non-surgical ENT conditions.

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In-Office Technology

At the California Sinus Centers we incorporate technology into our practice to ensure the highest degree of patient safety and treatment success. Click here for more information

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California Sinus Centers Physicians

Karen J. Fong, M.D.

Dr. Fong is a board certified otolaryngologist, specializing in rhinology, who emphasizes comprehensive, multi-disciplinary sinus care and patient education in her practice.  She joined Cal Sinus in 2007 from Portland, Oregon, where she was formerly on the faculty of Oregon Health and Science University. Dr. Fong sees patients at our locations in Walnut Creek and Pleasanton.

 Dr. Fong Full Biography

Contact & Locations

 (925) 300-4680
 Pleasanton Office
 Walnut Creek Office


Winston C. Vaughan, M.D.

Dr. Vaughan is a board certified, fellowship trained rhinologist who is committed to providing advanced sinus care in a caring and compassionate environment to his patients. He founded Cal Sinus in 2005 having previously served as the Director of the Stanford Sinus Center from 1998-2005. Dr. Vaughan sees patients at our Atherton, Fresno, Sacramento, Sonoma and Walnut Creek locations.

 Dr. Vaughan Full Biography

Contact & Locations

 (650) 399-4630
 Atherton Office
 Fresno Office
 Sonoma Office
 Walnut Creek Office


About the California Sinus Institute

The California Sinus Centers and Institute are the premier centers of excellence in Northern California for the care, research, and education of patients and disease related to the nose and sinuses. At Cal Sinus - we aim to provide the best care in difficult to treat sinus problems. Through better clinical and surgical care, research and education, we strive to improve your sinuses and overall health.

The doctors at CalSinus have performed thousands of sinus and nasal surgical procedure. With over a decade of experience, they have refined their skills: to increase your outcomes, avoid complications and provide the best of care.

Drs. Fong and Vaughan and Associates have cared for patients from the entire West Coast including California, Oregon, Hawaii, Idaho, Alaska, Washington and New Mexico - and also several International countries.

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