Poststenotic signal attenuation on 3D phase-contrast MR angiography: a useful finding in haemodynamically significant
T Iseda1, S Nakano, D Miyahara
1Departments of Neurosurgery, Junwakai Memorial Hospital and Miyazaki Medical College, Miyazaki, Japan. tiseda@fc.miyazaki-med.ac.jp
Abstract:
We performed blinded visual evaluation of MR angiography (MRA) films in 44 patients with unilateral carotid artery stenosis to determine whether a flow gap and poststenotic signal attenuation on 3D-PC MRA were useful signs of severe carotid artery stenosis. Although nine patients with a flow gap alone had various degrees of stenosis ranging from 22.2 to 77.3% without any decrease in regional cerebral blood flow (rCBF), 13 patients with both a flow gap and poststenotic signal attenuation had severe stenoses of 80% or more, with a definite decrease in baseline rCBF. The presence of both a flow gap and poststenotic signal attenuation on 3D-PC MRA appeared to be a reliable marker of severe carotid artery stenosis with a decrease in rCBF.
