Primary Neuroendocrine Carcinoma of the Ileum With Markedly Elevated Carcinoembryonic Antigen (CEA) Levels: A Case Report

Aya Sugimoto; Tsutomu  Nishida; Kana Hosokawa; Yoshifumi  Fujii; Dai Nakamatsu; Kengo  Matsumoto; Masashi  Yamamoto; Koji  Fukui; Aya Sugimoto; Tsutomu  Nishida; Kana Hosokawa; Yoshifumi  Fujii; Dai Nakamatsu; Kengo  Matsumoto; Masashi  Yamamoto; Koji  Fukui

doi:10.7759/cureus.66676

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