胰腺原发性类癌的CT表现

目的探讨胰腺原发性类癌的CT表现。方法回顾性分析经病理证实的5例胰腺类癌的CT表现。结果本组病例肿块最大径2．0—11．0cm，平均6．4cm。CT平扫肿瘤实质较胰腺稍低，密度均匀者2例，不均匀者3例，肿块钙化者1例。动脉期肿块不均匀明显强化者3例，轻度强化者2例，肿瘤实质密度均低于胰腺，有不同程度的坏死，其中1例中央坏死明显，无强化，整个肿块呈囊状；静脉期肿块强化程度明显，与胰腺相似或稍低；1例延迟期肿块强化程度高于胰腺。肝转移1例，同时伴腹膜后淋巴结肿大及血管侵犯。未见胆管及胰管扩张。结论胰腺类癌CT表现主要有较少引起胆道及胰管扩张，对周围血管较少累及，钙化较常见；增强后肿瘤实质明显强化，静脉期强化程度与胰腺相似，延迟期强化程度高于胰腺。

Primary carcinoid tumors of the pancreas: CT findings

Objective To evaluate the CT findings of pancreatic carcinoid tumors. Methods The CT imaging data of five patients with pancreatic carcinoid tumors confirmed by pathology were retrospectively analyzed. Results The tumors ranged in maximum diameter from 2. 0 to 11.0 cm with a mean of 6. 4 cm. On unenhanced CT, the tumors were slightly hypodense relative to the pancreatic parenchyma, homogenous in 2 cases, and heterogenous in 3 cases. One tumor showed calcification. After contrast material injection, the solid component of the tumor showed marked heterogenous enhancement on the arterial phase scanning in 3 cases, and mild heterogenous enhancement in 2 cases. The degree of tumor enhancement was less intense than the surrounding pancreatic parenchyma due to necrosis of various degree, which led to the cystic appearance of the tumor in 1 case. On the portal phase scanning, all tumors showed marked enhancement similar to that of the pancreatic parenchyma. On the delayed phase scanning, the degree of enhancement was more intense than the surrounding pancreatic parenchyma in 1 case. Liver metastases with retroperitoneal lymphadenopathy and peripancreatic vessels invasion were seen in 1 case. No dilatation of the biliary tract or pancreatic duct was present. Conclusion The CT features of pancreatic carcinoid tumors included infrequent dilatation of the biliary tract or pancreatic duct and unusual vascular involvement, calcification within the mass, marked enhancement similar to that of the surrounding pancreatic parenchyma during the portal phase scanning and more intense during the delayed phase scanning.