腮腺血管外皮细胞瘤的MRI征象分析

目的 探讨腮腺血管外皮细胞瘤的MRI表现,以期提高对本病的影像学认识。方法 回顾性分析5例经手术病理证实为腮腺血管外皮细胞瘤的临床、MRI影像及病理资料并复习相关文献。结果 5例腮腺血管外皮细胞瘤均单侧发病,3例位于右侧腮腺,2例位于左侧腮腺；3例形态规则呈类圆形,2例形态不规则；4例边界清楚,另外1例边界模糊；病变最大径约23- 51mm,平均34mm。MRI表现：平扫3例病变信号较均匀,其中2例T1WI呈低信号、T2WI呈较高信号,1例T1WI、T2WI均呈等信号；其余2例信号不均匀,1例伴钙化,1例伴出血坏死及囊变；1例病变周围可见增粗流空血管信号。增强扫描病变实质部分呈明显持续性强化,2例强化均匀,3例强化不均匀。结论 MRI增强扫描肿瘤实质部分呈明显均匀/不均匀持续强化是腮腺血管外皮细胞瘤较典型的影像表现,同时MRI检查能较好地显示肿瘤的范围。

MR imaging analysis of the parotid hemangiopericytoma

Objective To explore the MR imaging characteristics of the parotid hemangiopericytoma (PHC) with aim to improve the imaging diagnosis ability for PHC. Methods The clinical, MRI and pathological data of 5 cases of hemangiopericytoma of the parotid gland confirmed by surgery and pathology were retrospectively analyzed and related literatures were reviewed. Results All cases were unilateral, with 3 cases located in the right parotid gland and 2 cases located in the left parotid gland. 3 cases were circular and 2 cases were irregular. The boundary was clear in 4 cases and fuzzy in 1 case. The maximum diameter of the lesion was 23-51mm, with an average of 34mm. MRI findings: The lesion signal of 3 patients was uniform on plain scan, of which 2 patients showed low signal on T1WI and high signal on T2WI, and 1 patient showed isosignal on T1WI and T2WI. The signal of the other 2 cases was uneven, 1 case was accompanied by calcification, and 1 case was accompanied by hemorrhage, necrosis and cystic degeneration. In 1 case, the signal of thickened empty vessels was seen around the lesion. The enhancement in parenchyma was obvious and persistent, with uniform enhancement in 2 cases and uneven enhancement in 3 cases. Conclusion The tumor parenchyma showed obvious uniform / uneven continuous enhancement on enhanced MRI, which is a typical imaging manifestation of parotid hemangiopericytoma. At the same time, MRI can better show the scope of the tumor.