Dr. Hogg & Dr. Medina | Board Certified Physicians

The Medical Vein Clinic Story

Medical Vein Clinic was started to give patients suffering from vein disease an expert and caring medical treatment home. Our clinic’s founder, Dr. John Hogg, spent three years visiting other vein treatment centers around the United States to identify the best practices to bring to San Antonio. Since we opened our clinic doors in 2017, we’ve helped 1,000’s of people---and their legs----feel and look better.

Meet Our Team

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

Medical Vein Clinic’s Dr. Hogg talks to KSAT.com about vein disease.

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).

Board Certified Radiologist

John S. Hogg, M.D.

Board Certified Radiologist

Josue Medina, M.D.

Certified Vascular Surgeon

Thomas J. Gianis, II, MD, RPVI

Dr. Gianis is a Board-Certified Vascular Surgeon at Medical Vein Clinic who brings great experience, professional recognition, and research to this role. He received his undergraduate degree from Vanderbilt University and his medical degree from Ross University School of Medicine. Dr. Gianis’s surgical training includes a general surgery internship at Vanderbilt University, a surgical residency at Memorial University Medical Center in Savannah, Georgia, and a fellowship in vascular and endovascular surgery at the University of Virginia Medical School.

At Medical Vein Clinic, he thrives on evaluating, treating patients, and improving their vein and leg health. This New Jersey native is happy to make San Antonio home now, noting the people, weather, and Southern hospitality. When he’s not at work, he enjoys spending time with his wife and four young kids, golfing, fishing, skiing, and reading historical fiction. He’s also a die-hard University of Alabama and NY Jets football fan who doesn’t miss a game. Dr. Gianis’s golden retriever, Cooper, is a testament to his fandom level, named after Alabama wide receiver and now NFL standout, Amari Cooper.

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.”

Functional and Lymphedema Specialist

Tabitha Castillo, PT, DPT, CLT

As a Certified Lymphedema Therapist (CLT) as well as a Doctor of Physical Therapy (DPT), Castillo joined Medical Vein Clinic to focus on treating patients with lymphedema. Working closely with those experiencing swelling in their legs, she assesses their health, and shares treatments and practices to improve their mobility and quality of life. Dr. Castillo earned her doctorate in physical therapy degree from The University of Texas Health Science Center. She has a decade of rehabilitation experience, treating a variety of medical conditions in hospital and outpatient clinics.

“The joy and happiness I see on patients’ faces when their leg issues are diagnosed and resolved is so rewarding,” Castillo shared. When she’s not at the clinic helping patients, Castillo likes to read sci-fi books, work out at the gym, watch movies, and spend time with her cat, Matcha.

TIP

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.

TIP

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!