FIG 5. A, Histogram of mean values (± SD) for five histometric parameters that characterize various areas (in mm²) of the nidus microvessels when measured in the acute, 2-month-old, and 6-month-old AVM models. The five parameters were 1) area of the vessel lumen, 2) entire area enclosed by the internal elastic lamina, 3) area of intimal hyperplasia, 4) entire area enclosed by the outer margin of media, and 5) area of media.

B, Histogram of mean values (± SD) for the medial thickness and vessel radius (in mm) of the nidus microvessels when measured in the acute, 2-month-old, and 6-month-old AVM models.