Dr. Hogg & Dr. Medina | Board Certified Physicians | Medical Vein Clinic
Dr. Hogg patient consult

The Medical Vein Clinic Story

We want our patients to feel relaxed and cared for.

People tell us that our clinic seems more like a spa than a medical clinic. That is by design. We want our patients to feel relaxed and cared for. Our medical team has some of the most experienced vein specialists in the country. We have invested in the latest technology and equipment to treat vein disease. And, our clinic’s support staff is friendly, knowledgeable and treats every patient like family.


In the News

Understanding vein and lymphatic diseases and the risk factors associated with them

Vein and lymphatic diseas can lead to many issues in the body

Read the full article here

Our Doctors

Our lead physicians, Dr. Hogg and Dr. Josue Medina, have a depth of experience and accreditations in their field. Both are board certified by the American Board of Radiology, members of the Texas Medical Association, Bexar County Medical Society, Radiological Society of North America, Society for Vascular Ultrasound and the American College of Radiology.

Additionally, both physicians are diplomats of the American Board of Venous and Lymphatic Medicine, hold certifications as Registered Vascular Technologist (RVT) and Registered Physician in Vascular Interpretation (RPVI). Dr. Hogg is also registered by Cardiovascular Credentialing International as a Registered Vascular Sonographer (RVS), and as a Registered Phlebology Sonographer (RPhS).

Dr Hogg

Board Certified Radiologist

John S. Hogg, M.D.

Dr Medina

Board Certified Radiologist

Josue Medina, M.D.

Dr. Trock

Doctor of Physical Therapy, Lymphedema Specialist and
Registered Vascular Technologist

Joshua Trock, DPT, RVT, CLT-LANA

Dr. Trock complements the clinic’s varicose vein treatment experts, extending their services to care for patients suffering from lymphatic disease. Edema (swelling) caused by varicose veins or venous insufficiency is the leading cause of lymphedema. In addition to being LANA certified in Lymphedema Therapy as a Doctor of Physical Therapy, Dr. Trock is also a Registered Vascular Technologist (RVT). He is dedicated to evaluating and educating patients along with developing home treatment plans to resolve vein pain and swelling associated with vein disease. He also provides specialty counseling and treatment for those suffering from lymphedema. Dr. Trock received his bachelors and doctorate degrees in physical therapy from UT Health San Antonio and has applied his lymphatic disease knowledge to patient care for more than a decade. He is a subject matter expert and speaks nationally on the topics of lymphatic disease and lymphedema.


Nurse Practitioner

Jonathan Sidle, DNP, APRN, FNP-C

DNP Sidle is a member of MVC’s leadership team, brings more than a decade of treating patients for vascular disease and other chronic conditions. Successful vein disease management can positively impact many aspects of a patient’s health and this mission aligns with DNP Sidle’s passion for preventative medicine. At the clinic, DNP Jonathan evaluates patients, develops treatment plans and follows their progress back to health.

“In my previous years as a RN in hospitals and then as a DNP in primary care, I saw a lot of people with leg pain, ulcers and swelling. But often they, as well as their health care practitioners, didn’t seem to understand what was going on. What drew me to MVC is the opportunity to improve someone’s quality of life. We have these sophisticated ultrasound machines and the expertise to diagnose and provide solutions.”

DNP Jonathan earned both his Doctor of Nursing and RN-BSN degrees from UIW. Originally from Ohio, he and his wife enjoy raising their three kids in San Antonio and attending church. Fun fact: He’s also an expert coffee roaster and has favorite methods for brewing a great cup. This java connoisseur’s go-to bean? Ethiopian, straight up.


Nurse Practitioner

Adam Sahyouni, MSN, APRN, AGACNP-BC

NP Sahyouni joined the Medical Vein Clinic leadership team in 2024 as a Nurse Practitioner. He puts his eight years of nursing expertise to help MVC patients. He enjoys listening to their challenges, coming up with plans to eliminate those problems, and tracking their progress. “I got into medicine because I love interacting with patients and being of service.”

He received his BSN in nursing from the Chamberlain College of Nursing and his MSN with a specialty in adult gerontology and acute care from the UT Health Science Center. In 2020, Sahyouni was named a Healthcare HERO by the Texas Organization for Nursing Leadership.

A Texas native, he and his wife enjoy raising their blended family of five kids (three daughters and two sons). When Adam is not in the clinic, he enjoys watching football, playing and watching golf, and learning. “I am a lifelong student and always want to be expanding my knowledge to help our patients.”


Nurse Practitioner

Brenda Villarreal, FNP-C

Brenda Villarreal is a board-certified family nurse practitioner (FNP-C) who works with Medical Vein Clinic patients to educate and treat their vein disease and lymphedema.

FNP Brenda received a bachelor’s degree in biology from Texas A&M International University where she taught biology and chemistry before pursuing a career in nursing. She completed her nursing studies at University of Texas Health Science Center San Antonio, graduating Magna Cum Laude. FNP Brenda spent five years as a nurse in hospital ICU and acute care units before furthering her education, obtaining her Masters of Science in Nursing: Family Nurse Practitioner, from The University of Texas Arlington. 

During her nursing career, FNP Brenda has been a member of a pain management committee, working with other clinicians to make recommendations on how to administer pain medication safely using evidence-based practice. Fluent in Spanish and English, she also participated in professional development seminars for patient-controlled analgesia pump compliance measures. FNP Brenda has also volunteered for Bosom Buddies Breast Cancer Support, Inc. supporting breast cancer patients and members.    

FNP Brenda is a member of the American Association of Nurse Practitioners (AANP). Outside of Medical Vein Clinic, she enjoys spending time with her husband, their two children and three dogs. 


Is your sleep disrupted by restless legs?

It could be Restless Leg Syndrome (RLS)! Recognize the signs: irresistible leg urges, tingling sensations, leg twitching, worsening issues at night, restlessness, and fatigue. Don't ignore—RLS might signal an underlying vein disease

MVC women

Did you know that varicose veins affect more women than men?

Studies show that about 55% of women and 45% of men suffer from varicose veins which can lead to deep vein thrombosis, blood clots, edemas and more. It's not just about appearance – varicose veins can lead to discomfort. If you're looking for relief, we’re here to help! 

We truly love
what we do.

Give us a call today to book your appointment.

Dr. Hogg Dr. Medina front desk

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Se Habla Español

Our Offices

622 Isom Rd.
San Antonio, TX 78216

5742 W. Loop 1604 N
San Antonio, TX 78251

Office Hours

Monday - Thursday
8 am to 5 pm
Friday 8 am to 12 pm


8 am to 12 pm

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