Sarcoid reaction associated with Merkel cell carcinoma revealed by fluorodeoxyglucose positron emission tomography: a case report oleh Matsushita Shigeto, Baba Atsunori, Hisadome Mitsuhiro, Shimokawa Mitsuyoshi, Mera Kentaro, Higashi Yuko, Yanagi Masakazu, Kanekura Takuro