tandem lesions
Pronunciation: TAN-dem LEE-zhunz
Multiple sequential stenotic lesions in the same arterial vessel or circulation. Important consideration for intervention planning and hemodynamic assessment.
Full Definition
Tandem lesions refer to multiple stenotic or occlusive lesions occurring in sequence within the same arterial vessel or vascular territory, creating a series of flow-limiting segments. These lesions pose particular challenges for hemodynamic assessment since the pressure gradients and flow characteristics across each individual stenosis are influenced by the presence of upstream and downstream lesions. In cerebrovascular disease, tandem lesions commonly involve both extracranial carotid and intracranial vessels. The presence of tandem lesions complicates treatment planning as intervention on one lesion may alter the hemodynamic significance of others. Comprehensive imaging assessment must evaluate each lesion individually while considering their collective impact on overall flow dynamics.
Usage
Usage note: Tandem (in series) vs. parallel (side-by-side); ensure correct usage in describing lesion relationships.
In Context
- "The patient presented with tandem lesions involving both the cervical carotid bifurcation and the intracranial M1 segment." — Stroke workup report