胰腺实性假乳头状肿瘤的MR影像特点分析(附9例报道)

MRI features of solid pseudopapillary tumor of the pancreas:A report of 9 cases

目的分析胰腺实性假乳头状肿瘤（SPT）的MRI特点。方法回顾性分析9例经手术病理证实的胰腺SPT患者的MRI表现。结果肿瘤位于胰头3例,胰体3例,胰尾2例,胰体尾1例。肿瘤大小为2.2~14.0 cm,中位数为6.0 cm。胰腺SPT在T1WI上呈不均匀低信号8例,不均匀等信号1例;在T2WI上呈不均匀高信号8例,不均匀等信号1例,增强后肿瘤呈轻或中度强化。5例肿瘤见与脑脊液信号类似之长T1长T2信号的囊性区域。9例肿瘤在T1WI上均见斑点、斑片状高信号区,提示肿瘤内出血。9例肿瘤在T1WI及T2WI上均见低信号包膜,增强后呈轻或中度强化。结论胰腺SPT的MRI表现具有一定特点,有助于胰腺SPT的诊断。

Objective To analyze the MRI features of solid pseudopapillary tumor（SPT） of the pancreas.Methods MRI findings of 9 patients with pathologically proven SPT in the pancreas were retrospectively reviewed.Results SPT located in the head（n=3）,body（n=3）,tail（n=2） or body and tail of the pancreas（n=1）.The median diameter of these tumors was 6.0 cm（2.2—14.0 cm）.SPT showed inhomogeneous low signal intensity in 8 and isointensity in 1 patient on T1WI,inhomogeneous high signal intensity in 8 and isointensity in 1 patient on T2WI,and slightly to moderate enhanced after Gd-DTPA administration.Areas of internal cystic degeneration with the signal intensity similar to cerebrospinal fluid were observed in 5 patients.Spot-like or patchy high signal intensity on T1WI suggesting hemorrhage was observed in all 9 patients.Capsule of low signal intensity and lightly to moderate enhancement after Gd-DTPA administration were observed on both T1WI and T2WI.Conclusion MRI findings of SPT are characteristic,therefore valuable for diagnosis of SPT.