Marginal calcification of thymoma: differences in the location of calcification indicate differences in the characteristics of thymomas

Rintaro Imazu, Motoki Yano, Yuka Kitagawa, Ryotaro Katsuya, Sawako Okamaoto, Chihiro Furuta, Yuta Kawasumi, Naoki Ozeki, Emiko Takahashi, Takayuki Fukui