Fig. 7.

LNB vasculitis in a 55-year-old woman with strange behaviour for 3 days preceding hospital admission. She had incoherent speech and was disorientated. CSF cell count was 213 cells/mm³ and Bb IgG AI was positive. MRI revealed ischemic lesions of different ages in thalamus bilaterally (a–f), right cerebral peduncle (g–i) and right occipital cortex (not shown). Axial T2-weighted images (a, d, g), diffusion weighted B1000 images (b, e, h) and ADC maps (c, f, i) demonstrated the lesions. In contrast to the hypointense lesions on ADC maps in the thalami (arrows in c and f) consistent with cytotoxic edema in recent infarcts, the lesion in the right cerebral peduncle was hyperintense on both B1000 image (arrow in h) and ADC map (arrow in i), consistent with vasogenic edema and a more advanced stage of ischemic lesion. 5 mm MIP coronal (j) and axial (k) reformats of CT angiography examination demonstrated several short stenotic segments of both posterior cereberal arteries (arrows), most pronounced on the right side