A case of de novo extra-stent ulceration induced by persistent plaque protrusion after carotid artery stenting with a CASPER stent for a large-volume unstable plaque oleh Ryo Aiura, MD, Yoshikazu Matsuda, PhD, Tomoya Matsumoto, MD, Shun Takano, MD, Minako Kubo, PhD, Ryo Irie, MD, Eisuke Hirose, MD, Takato Nakajyo, PhD, Tatsuya Sugiyama, PhD, Tohru Mizutani, PhD