Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.
A cyst is a closed sac- or bladder-like structure that is
not a normal part of the tissue where it is found. Cysts are common and can
occur anywhere in the body in persons of any age. Cysts usually contain a
gaseous, liquid, or semisolid substance. Cysts vary in size; they may be
detectable only under a microscope or they can grow so large that they displace
normal organs and tissues. The outer wall of a cyst is called the capsule.
Cysts can arise through a variety of processes in the body, including...
A ganglion is a sac-like swelling or cyst formed from the tissue that
lines a joint or tendon. The tissue, called synovium, normally
functions to produce lubricating fluid for these areas. A ganglion
is a cyst formed by the synovium that is filled with a thick jelly-like fluid. While ganglia can follow local trauma to the tendon or
joint, they usually form for unknown reasons. Occasionally, ganglia
are early signs of arthritis that will become more obvious in the future.
Where do ganglia form and what symptoms do they cause?
Ganglia can form around any joint, but they are most frequently found
in the wrist and ankles. They are usually painless and often barely
visible as localized swellings. They typically do not appear to be inflamed. The largest ganglions form behind the back of the knee, causing a sense of fullness or tightness. A ganglion here is referred to as a Baker cyst, after the doctor who originally described the condition.
How are ganglia treated?
A ganglion can spontaneously rupture and go away. Other treatment
options include removal of the ganglion fluid with a
needle and syringe (aspiration) with or without an injection of cortisone
medication. Occasionally, the entire ganglion is resected with
surgery. People with a persisting or recurring ganglion should be evaluated for signs of systemic forms of arthritis, such as rheumatoid arthritis.
Rheumatoid arthritis is an autoimmune disease that causes chronic inflammation of the joints, the tissue around the joints, as well as other organs in the body. Because it can affect multiple other organs of the body, rheumatoid arthritis is referred to as a systemic illness and is sometimes called rheumatoid disease.
Herpes simplex infections are common and when they appear around the mouth and lips, people often refer to them as "cold sores" and "fever blisters." Canker sores are different than cold sores. Air droplets can spread the virus, as can direct contact with the fluid from the blisters. Cold sore treatment include over-the-counter medication as well as prescription medications.
Cysts are saclike structures that can occur throughout the body and usually contain a semisolid, liquid, or gaseous substance. Infections, tumors, genetic conditions, chronic inflammatory conditions, and wear and tear can cause cysts. Though some cysts may be palpable, others may not produce any symptoms. Treatment depends upon the location and cause of the cyst.
Osteoarthritis is a type of arthritis caused by inflammation, breakdown, and eventual loss of
cartilage in the joints. Also known as degenerative arthritis. Osteoarthritis
can be caused by aging, heredity, and injury from trauma or disease.
A Baker cyst, also called a popliteal cyst, is swelling caused by knee joint fluid protruding to the back of the knee (popliteal area of the knee). Not uncommon, baker cysts can be caused by virtually any type of joint swelling (arthritis). They are often resolved with removal of excess knee fluid in conjunction with cortisone injections.
A Baker cyst is swelling caused by fluid from the knee joint protruding to the back of the knee.
Baker cysts are not uncommon and can be caused by virtually any cause of joint swelling (arthritis).
A Baker cyst may cause no symptoms or be associated with knee pain and/or tightness behind the knee, especially when the knee is extended or fully flexed.
Baker cysts can rupture and become complicated by protrusion of fluid down the leg between the muscles of the calf (dissection).
Baker cysts can be treated with medications, joint aspiration and cortisone injection, and surgical operation, usually arthroscopic surgery.
What is a Baker cyst?
A Baker cyst is swelling caused by fluid from the knee joint protruding to the back of the knee. The back of the knee is also referred to as the popliteal area of the knee. A Baker cyst is sometimes called a popliteal cyst. When a...
A cyst is a closed sac- or bladder-like structure that is
not a normal part of the tissue where it is found. Cysts are common and can
occur anywhere in the body in persons of any age. Cysts usually contain a
gaseous, liquid, or semisolid substance. Cysts vary in size; they may be
detectable only under a microscope or they can grow so large that they displace
normal organs and tissues. The outer wall of a cyst is called the capsule. 
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