if you're wanting an explanation for what this means here it is: it means there is some tissue death in the ankle specifically around the bone that joins the ankle to the two bones of the lower leg (where your foot bends in the front). the ankle bone called the " talus " is directly below the bottom of your shin bone. the test result you quoted means there's some sort of localized tissue damage in that area. hope this helps!
focus necrosis at the superior medial aspect of the talus