Metal? cristae inclusions in mitochondria

I found a paper that showed a TEM of a dense round intracrista inclusion that had some similarities to what is seen in the Gclcwc/ii hepatocyte specific KO mouse at 50 post natal days.  Paper is Characterization of Intracellular Inclusions in the Urothelium of Mice Exposed to Inorganic Arsenic Toxicological Sciences 137(1), 2013 by Puttappa Dodmane et al. I cut and pasted part of one of their electron micrographs of a mitochondrion with such an intracristae inclusion (right side of picture) next to what is seen in the KO mouse (my picture, left side of image).