Tumor seeding after endoscopic ultrasound-guided fine-needle aspiration of cancer in the body of the pancreas

 

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The use of endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) has been rapidly expanding as a useful examination technique which enables highly accurate histological diagnosis. Reports of tumor dissemination induced by EUS-FNA are rare [1] [2] [3] [4] [5]. We recently encountered a case in which tumor cells were observed in the puncture line in a surgically resected specimen after EUS-FNA, and in which dissemination in the posterior wall of the upper gastric body was later observed.

The patient was a 68-year-old woman. A computed tomography (CT) scan revealed a 2-cm mass in the pancreatic body, which was suspected to be pancreatic cancer. We scheduled distal pancreatectomy, and to obtain a definitive diagnosis the patient underwent preoperative EUS-FNA with a 22-gauge needle (Olympus Medical Systems, Tokyo, Japan) inserted four times, which yielded a diagnosis of adenocarcinoma. No clinical complications developed after EUS-FNA. Distal pancreatectomy was performed 20 days after the EUS-FNA and, intraoperatively, bleeding and adhesion were observed at the puncture sites ([Fig. 1]). Histopathology of the surgically resected specimen confirmed adenocarcinoma (T2N0M0). A small number of tumor cells were found within the lymphatic vessels of the resected specimen, similar to the areas of bleeding and adhesion ([Fig. 2]).

At 22 months after distal pancreatectomy, upper gastrointestinal endoscopy revealed a submucosal tumor-like mass in the posterior wall of the upper gastric body ([Fig. 3 a]), which was subsequently confirmed to be adenocarcinoma by biopsy ([Fig. 3 b]). An abdominal CT scan did not reveal any local recurrence at the resected site of the pancreas or lymph node metastasis around the stomach, but a tumor was observed on the posterior wall of the gastric body ([Fig. 4]).

In the present case, bleeding was seen at the puncture sites and tumor cells were observed within the lymphatic vessels in these areas. As similar findings were absent in the areas which were free of bleeding or adhesion, we speculated that the punctures caused the bleeding and adhesion, and that subsequent reactive changes facilitated the survival of tumor cells within the lymphatic vessels. Moreover, it is possible that similar changes occurred in the gastric wall.

Endoscopy_UCTN_Code_CPL_1AL_2AD

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