A case of schwannoma arising from nerve plexus around the common hepatic artery showing high fluorodeoxyglucose uptake on positron emission tomography with increase in tumor diameter

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A 58-year-old man was referred to our hospital for retroperitoneal tumor (23 mm in diameter) showing a high fluorodeoxyglucose (FDG) uptake on positron emission tomography (PET). Two years earlier, the presence of this tumor (15 mm in diameter) had been demonstrated on plain abdominal CT, and he was closely followed because there had not been any FDG uptake on PET. Abdominal CT and MRI after hospitalization showed a retroperitoneal tumor in the area adjacent to the celiac axis and the common hepatic artery. Since this tumor demonstrated high FDG uptake on PET along with an increase in tumor size, we could not deny the possibility of a malignant tumor. Laparotomy was thus performed under preoperative diagnosis of a retroperitoneal tumor, including neurilemmoma. A firm tumor measuring 23 mm in diameter adhered to the nerve plexus around the common hepatic artery, and the tumor was excised along with the surrounding capsule. Pathological diagnosis was Antoni A type schwannoma consisting of spindle cells presenting a palisade arrangement without malignant change. From the intraoperative findings, this neurilemmoma was considered a rare lesion arising from the nerve plexus around the common hepatic artery.
日本臨床外科学会の論文