螺旋CT对胰腺实性假乳头状瘤的诊断及外科价值探讨

目的 研究胰腺实性假乳头状瘤的CT表现及图像后处理技术在外科手术中的价值.方法 回顾性分析14例经手术病理证实的胰腺实性假乳头状瘤的临床特征及CT表现.结果 (1)13例肿瘤由实性部分和囊性部分构成,1例肿瘤为单纯实性.肿瘤实性部分动脉期呈轻度强化,门静脉期明显强化;囊性部分在增强前后均呈低密度.肿瘤有包膜,增强后包膜强化明显,与胰腺分界清晰.(2)14例均无肝内外胆管和胰管扩张,1例伴发右肾上腺节细胞神经瘤.(3)胰头部肿瘤5例,其中3例肠系膜上动静脉受压移位,2例血管部分被肿瘤包绕.胰尾部肿瘤6例,其中3例肿瘤推挤脾门,造成多支脾静脉迂曲扩张,分别从肿瘤的前方和后方汇入肠系膜上静脉;2例显示脾静脉受压后移;1例肿瘤与脾门结构分界不清.结论 胰腺实性假乳头状瘤具有较特征性的CT表现,结合临床特征可在术前作出诊断.三维后处理技术可以很好显示肿瘤与邻近结构的关系,为手术治疗提供重要依据.

Diagnosis of solid-pseudopapillary tumor of the pancreas and the value of post-processing in the surgery by spiral CT

Objective To study the CT manifestations of the solid-pseudopapillary tumor of the pancreas (SPTP) and tu explore the value of post-processing in the surgery. Methods Clinical and CT features of 14 patients with SPTP proved pathologically were retrospectively analyzed. Results (1) 13tumors were composed of different proportions of solid and cystic parts and 1 tumor was composed of solid part only. The solid portions demonstrated slight enhancement in the arterial phase and marked enhancement in the portal venous phase on post-contrast CT. The cystic portions appeared hypo-attenuation on both pre-and post-contrast CT images. Tumors were encapsulated and the capsule enhanced markedly with well-defined margins on post-contrast images. (2) Dilatation of the common bile duct or pancreatic duct wasn't seen in all of the cases and 1 case with the right adrenal ganglioneuroma. (3) 5 tumors located in the head of the pancreas, 3 of which with the superior mesenteric vein compression and displacement, in 2 cases the vessels were partially encapsulated by tumor. 6 tumors located in the tail of the pancreas, 3 of them with splenic hilum compression and multiple splenic vein tortuesity and dilatation, the veins drained into superior mesenteric vein anteriorly and posteriorly of the tumor. Splenic vein compression and posterior displacement occurred in 2 cases. In one case, there was no clear margin between the tumor and the splenic hilum. Conclusion The SPTP has characteristic CT findings and correct diagnosis could be made by combining clinical features. The relationship of the lesions and surrounding structures could be revealed by the post-processing and was helpful for the operation.