collateral circulation
Alternative blood flow pathways that develop to bypass blocked or narrowed vessels.
Full Definition
Collateral circulation refers to the development of alternative vascular pathways that provide blood flow around areas of vascular obstruction or stenosis. These accessory vessels can be pre-existing but become more prominent, or they can develop through angiogenesis in response to chronic ischemia. In vascular imaging, collateral vessels appear as tortuous, smaller-caliber arteries that connect the proximal and distal segments of an occluded vessel or provide flow via alternative anatomical routes. The presence and extent of collateral circulation significantly influence patient symptoms, tissue viability, and treatment options in vascular disease.
Usage
Usage note: Specify the anatomical route or vessel names when describing collateral pathways.
In Context
- "Excellent collateral circulation was noted bypassing the occluded superficial femoral artery." — Peripheral angiography report
- "The patient's symptoms were minimal due to well-developed collateral circulation." — Vascular surgery consultation