Methotrexate‐associated lymphoproliferative disorder: A rare pancreatic tumor diagnosed via endoscopic ultrasound‐guided fine‐needle biopsy by Koh Kitagawa, Masafumi Oyama, Shohei Asada, Shinya Sato, Tatsuya Nakatani, Naoki Nishimura, Yuka Mui, Jun‐ichi Hanatani, Maiko Takeda, Hitoshi Yoshiji

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