Occult Papillary Thyroid Carcinoma without Detection of the Primary Tumor on Preoperative Ultrasonography or Postoperative Pathological Examination: A Case Report by Gai Yamashita, Takahito Kondo, Akira Okimura, Munehide Nakatsugawa, Hiroshi Hirano, Atsuo Takeda, Naiue Kikawada, Yusuke Aihara, Yuujin Chiba, Yasuo Ogawa, Kiyoaki Tsukahara

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