Published February 11, 2021 as 10.3174/ajnr.A6973 LETTERS Primary Angiitis of the CNS with Unremarkable Vessel Wall MR Imaging: How the “T1 Shinethrough” Effect on SWI Adds to the Detection of Gadolinium Enhancement of Small Intraparenchymal Brain Vessels he article published by Suthiphosuwan et al in the high-resolution images that provide higher sensitivity than TSeptember 2020 edition of AJNR made a strong impression T2*-weighted imaging to detect brain hemorrhage and cal- on us. The authors elaborate on the clinical, histopathologic, and cification. It is also useful to acquire intracranial venog- imaging findings of biopsy-proved cases of primary central nerv- raphy (venous bold imaging). Although in that sequence ous system vasculitis (PCNSV). the T2* and phase effects are dominant, the signal inten- One of the major difficulties in the diagnosis of tumefac- sity is also a function of molecular transverse relaxation tive primary CNS vasculitis (t-PCNSV) is the differentiation time for gradient-echo imaging; therefore, T1 effects are 1,2 of this condition from malignant neoplasms. The absence still present. This phenomenon is termed the “T1 shi- of abnormalities in large- and medium-sized vessels on CTA, nethrough” effect and can be exploited for the detection of MRA, and high-resolution vessel wall imaging makes
American Journal of Neuroradiology – American Journal of Neuroradiology
Published: Feb 11, 2021
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