dissection flap
A mobile intimal layer within an arterial dissection that can obstruct flow or create a false lumen.
Full Definition
A dissection flap refers to the torn intimal layer that remains attached to the vessel wall in arterial dissection, creating separation between the true and false lumens. These flaps can be static or highly mobile, and their movement may cause intermittent flow obstruction or dynamic stenosis. In vascular imaging, dissection flaps appear as linear filling defects that may undulate with arterial pulsation. The presence, length, and mobility of dissection flaps are important factors in determining treatment strategy, as extensive or mobile flaps may require intervention to prevent progression or complications.
Usage
Usage note: Always use 'flap' rather than 'flag'; emphasize the mobile nature when present.
In Context
- "Angiography revealed a mobile dissection flap causing dynamic obstruction of the vessel lumen." — Aortic dissection evaluation
- "The dissection flap extended from the root to the descending thoracic aorta." — Cardiac CT angiography report