Fig. 1
From: Dilated perivascular spaces and steno-occlusive changes in children and adults with moyamoya disease
Representative example of dilated perivascular spaces (DPVS) and MRA grade in 52-year-old female with hypertension, diabetes, and hyperlipidemia. (a) Less than 10 DPVS (arrowheads, degree of 2) are observed in both basal ganglia. (b) More than 40 DPVS (arrowheads, degree of 4) are observed on both white matters: it can be defined as symmetry between the DPVS degrees of both sides. (c) The right side have the MRA score of (ICA, 1 + MCA, 3 + ACA, 2 + PCA, 0) and the MRA grade of 3. The left side have the MRA score of 7 (ICA, 2 + MCA, 3 + ACA, 2 + PCA, 0) and the MRA grade of 3. Therefore, it can be defined that both MRA grades are symmetric with each other