• Takaomi Seki, Hideki Suzuki, Satoru Yasukawa, Aya Takase, Yoshiyasu Takayama, Fukiko Yoshinari, Ayako Matsui, and Ken Shirabe.
• Department of Surgery, Isesaki Municipal Hospital, Japan.
• Intern. Med. 2023 Oct 1; 62 (19): 284728532847-2853.

AbstractA 74-year-old woman was referred to our hospital for the evaluation of slightly elevated tumor marker levels. Computed tomography revealed a well-demarcated tumor, approximately 15 mm in diameter, in the pancreatic tail. Endoscopic ultrasound-guided fine-needle aspiration findings suggested poorly differentiated cancer. The tumor was surgically resected, but postoperative pathologic confirmation was not possible. After one year without treatment and no recurrence, an evaluation by a specialized facility was requested for a definitive diagnosis. Adenomatoid tumor was deemed most likely based on the histopathology and immunostaining findings; however, a definitive diagnosis was difficult because of atypical findings. The patient was recurrence-free for 36 months at the last follow-up.

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