Cervicobrachialgia is a clinical term for neck pain that extends into the shoulder, arm, and sometimes the hand. It describes a symptom pattern rather than a single disease. The term is commonly used in spine, neurology, orthopedics, and pain medicine to communicate “neck-to-arm” pain distribution. Clinicians use it as a starting point to evaluate possible nerve, disc, joint, or muscle-related causes.

OCT most often means **optical coherence tomography**. It is a **high-resolution imaging test** that uses light to create detailed pictures of tissue. In cardiovascular care, OCT is commonly used **inside blood vessels**, especially the **coronary arteries**. It is usually performed **during cardiac catheterization** to guide diagnosis and treatment decisions.

Sciatica is a term for pain that travels from the low back or buttock down the leg along the sciatic nerve pathway. It is commonly used to describe “nerve-type” leg pain, often with tingling or numbness. Sciatica is a symptom pattern, not a single disease. It is used in primary care, physical therapy, sports medicine, and spine specialty clinics to guide evaluation.

Optical Coherence Tomography is an imaging method that uses light to create very detailed pictures of tissue. In cardiovascular care, it is most often used inside blood vessels to view the artery wall from the inside. Clinicians commonly use it during heart catheterization procedures, especially coronary stent procedures. It is also widely used in eye care, but this article focuses on cardiovascular use.

Radicular pain is pain that starts from irritation of a spinal nerve root. It is often felt along the path of the nerve into an arm or a leg. People commonly describe it as sharp, shooting, or electric-like. Clinicians use the term to describe a specific pain pattern that helps narrow possible spine-related causes.

Pseudoclaudication is a clinical term for leg symptoms brought on by walking or standing. It most commonly refers to *neurogenic claudication* from lumbar spinal stenosis. It is “pseudo” because it can resemble vascular claudication but is not primarily caused by poor leg blood flow. Spine clinicians use it to describe a characteristic symptom pattern and guide further evaluation.

Neurogenic claudication is leg pain, heaviness, or fatigue that comes from irritation or compression of spinal nerves. It is most commonly discussed in the setting of lumbar spinal stenosis (narrowing of the spinal canal in the low back). Symptoms often worsen with standing or walking and improve with sitting or bending forward. The term is used by spine clinicians to describe a specific symptom pattern and to guide diagnosis and treatment planning.

IVUS stands for intravascular ultrasound, an imaging method performed from inside a blood vessel. It uses a tiny ultrasound probe on a catheter to create detailed pictures of the vessel wall and lumen (the channel where blood flows). IVUS is commonly used during cardiac catheterization, especially in coronary artery procedures such as angioplasty and stent placement. It may also be used in selected peripheral (non-heart) vascular procedures, depending on the vessel and clinical goals.

Epidural fibrosis is scar tissue that forms in the epidural space around the spinal nerves. It most commonly develops after spine surgery, especially after procedures that expose the nerve roots. Clinicians use the term to describe a healing response that may or may not be related to ongoing symptoms. It is most often discussed in the context of persistent leg or arm pain after surgery.

Intravascular Ultrasound is a catheter-based imaging test done from inside a blood vessel. It uses ultrasound (sound waves) to create cross-sectional pictures of the vessel wall and lumen (the open channel where blood flows). It is most commonly used during cardiac catheterization, especially when treating coronary artery disease. It can also be used in selected peripheral artery and venous procedures.