Abstract: 【Abstract】〓Objective〓To explore the magnetic resonance imaging (MRI) features of intracranial hemangiopericytoma (HPC) and meningioma (M) in the similar location, and to help to improve the differential diagnosis and reduce the misdiagnosis. Methods MRI manifestation was retrospectively analyzed in 4 cases of intracranial hemangiopericytoma and 5 cases of meningioma in the similar location from 2011 to 2015. All cases were confirmed by surgery and pathology. Results〓In the left frontal area, there were one case of hemangiopericytoma and 2 cases of meningioma. In the left occipital area, the bottom of the left cranial fossa and the posterior fossa under the cerebellar tentorium, there were one case of hemangiopericytoma and one case of meningioma, separately. All of nine cases were with lobulated sign (HPC: 4; M: 5), and 8 cases were with necrosis and cystic changes (HPC: 4; M: 4). Vascular flowing void effect existed in 4 cases (HPC: 4; M: 0). Seven were with peritumoral edema (HPC: 3; M: 4). Four cases with bone changes including HPC in two, in which one with skull metastasis and one was adjacent bone destruction, M in two, one with adjacent osteosclerosis, another with adjacent bone destruction. Dural tail sign existed in 5 cases (HPC: 1; M: 4). Comparing with meningioma, HPC often has irregular form with obvious lobulated signal and uneven parenchyma signals which demonstrate as obvious necrosis and cystic changes. In T1-weighted imaging (T1WI), the signal of its substantial were slightly higher than that of meningioma. Vascular flowing void effect and peritumoral edema were relatively common in HPC while dural tail signs were relatively rare..Conclusion...Comparing to the meningioma,.the hemangiopericytoma appeared to have relatively more common signs of lobulated signs,.vascular flowing void effect, obvious necrosis and cystic changes and skull metastasis. This may have a certain significance in the differential diagnosis between intracranial hemangiopericytoma and meningioma in MRI.

Key words: Hemangiopericytoma, Meningioma, Magnetic resonance imaging

摘要： 【摘要】 目的 探讨相似部位颅内血管周细胞瘤与脑膜瘤的MRI特征,以提高鉴别诊断水平,降低误诊率。方法〓收集我院2011年至2015年经手术病理证实的血管周细胞瘤4例与相似部位的脑膜瘤5例,对其MRI表现进行回顾性分析。结果〓左额区血管周细胞瘤1例,脑膜瘤2例;左枕区、左中颅窝底及幕下后颅窝血管周细胞瘤及脑膜瘤均各1例。影像表现分叶征9例(血管周细胞瘤4例;脑膜瘤5例),坏死囊变8例(血管周细胞瘤4例;脑膜瘤4例),血管流空效应4例(血管周细胞瘤4例),瘤周水肿7例(血管周细胞瘤3例;脑膜瘤4例),骨质变化4例(血管周细胞瘤2例,其中1例颅骨转移,1例为邻近骨质破坏;脑膜瘤2例,其中1例骨质硬化,1例骨质破坏),脑膜尾征5例(血管周细胞瘤1例;脑膜瘤4例)。与脑膜瘤相比,血管周细胞瘤的分叶征、瘤周水肿程度及肿瘤内坏死囊变较脑膜瘤更加明显,另外血管周细胞瘤实质部分TIWI信号稍高,可见丰富肿瘤血管,少见脑膜尾征。结论〓在颅内血管周细胞瘤与脑膜瘤的MRI鉴别诊断因素中,肿瘤可见丰富血管影,分叶征程度、瘤内坏死囊变较脑膜瘤明显,颅骨转移等征象,对提高颅内血管周细胞瘤的诊断有一定意义。

关键词: 血管周细胞瘤, 脑膜瘤, 磁共振成像