• Ayana Ishizaki, Kosuke Okuwaki, Mitsuhiro Kida, Hiroshi Imaizumi, Tomohisa Iwai, Hiroshi Yamauchi, Toru Kaneko, Rikiya Hasegawa, Hironori Masutani, Masayoshi Tadehara, Kai Adachi, Masafumi Watanabe, Takahiro Kurosu, Akihiro Tamaki, and Wasaburo Koizumi.
• Department of Gastroenterology, Kitasato University School of Medicine, Japan.
• Intern. Med. 2021 May 1; 60 (9): 1377-1381.

AbstractWe herein report the first case of metastatic pancreatic leiomyosarcoma derived from the urinary bladder diagnosed by an endoscopic ultrasound-guided fine-needle biopsy (EUS-FNB) in a 65-year-old woman. The patient had undergone total cystectomy for bladder leiomyosarcoma. Four years thereafter, a nodule was observed in her left lung on chest computed tomography. Suspecting primary lung cancer, pulmonologists at our hospital recommended a thoracoscopic lung biopsy, which the patient refused. Five years post-cystectomy, fluorodeoxyglucose positron emission tomography revealed enlargement of the left lung nodule and a new mass in the pancreatic head. She was referred to our department for the pathological diagnosis of a pancreatic head mass by an EUS-FNB. The EUS-FNB yielded adequate pancreatic tissue for an immunohistochemical analysis. A diagnosis of metastatic pancreatic lesion originating from the urinary bladder was made. In atypical pancreatic tumors, the utilization of an EUS-FNB and immunohistochemical analysis can help establish an accurate diagnosis.

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